Effectiveness:

This unit comes with only one group that is users place in their most troubled areas. It has a range of effect that spans 40 feet forward at a 70-degree angle from the base of the unit. Users can opt to select an ultrasonic sound frequency that only small animals can hear, or they can opt for an audible tone. This unit also has a flashing strobe light to spook those critters coming into your garden for a little late-night snack. Just place it onto the ground, turn it on, and walk away.

Power:

While some options are solar-powered, this unit requires 2 D batteries to operate. If you don’t want to use batteries, a power plug is offered at a low additional cost to allow you to plug it into a power outlet. What’s great about using batteries or electrical outlets is that you don’t need to wonder about power getting to your unit after a string of cloudy, rainy days.

Value:

The cost of this unit runs pretty par for the course in comparison to some of the other similar designs out there on the market. This design will likely set you back the same amount of money that you would spend to fill your car with gas. PREDATORGUARD is so confident that their unit will keep unwanted visitors out of your yard, that they offer a 100 percent money-back guarantee if it doesn’t work for you.

Summary:

For those that want something that they can just stake into the ground and forget about it, this is an excellent option. Plus, because it is offered with a 100 percent satisfaction guarantee, there is very little reason for you to not at least give this design a try.

Effectiveness:

This cat repellent unit has the ability to scare off critters 40 feet away within a 120 radius of the device. Not only does it use ultrasonic sound to scare away unwanted guests, but this unit also emits an audible sound as well, and it has two LED strobe lights on the front that trigger from motion sensors. User love that it comes with a long stake to place it in the middle of their yard, but it can also be mounted to the side of a wall or telephone pole.

Power:

There is no need to buy any batteries or run the wire to hook it up to an electrical outlet. This unit has a solar panel on the top that sends power to the rechargeable batteries found inside the unit. That means that even if the sun hasn’t been out for days, there will be enough juice in the batteries to power your unit enough to scare some critters.

Value:

The Diaotec runs about in the middle of the road in terms of price. It isn’t the most expensive design out there on the market, but it isn’t the least expensive either. It doesn’t offer a guarantee the way that others do, but users seem to be generally pleased with the effectiveness of this product.

Summary:

If you were in the market for a scary robotic owl to scare away all of the critters wreaking havoc in your yard 24 hours a day, the Diaotec is an excellent choice that comes in at an affordable price point.

Effectiveness:

Users love that this design offers a mixture of different sounds that range from ultrasonic to sonic to ensure that it will cycle through to a sound that will be unpleasant to your unwanted guests. It also has a pair of flashing LED lights on the front to also scare away pests 24 hours a day.

Power:

There are three rechargeable batteries mounted on the back panel of this design, and they are charge up throughout the day via a solar panel on the top of this design. The batteries are great because if the sun hasn’t been out for a few days, they will still have enough power reserved to operate your unit.

Value:

The best part about this design is that it comes in at a much lower price point than many of the other designs out there on the market. Plus, if you find that you are not satisfied with the performance of this design, APlus+ offers to replace your unit or supply a refund

Summary:

For those that are a little bit skeptical as to whether or not these types of products actually work, this design is a perfect place to start because it is priced much lower than many of the other similar brands, and has a satisfaction guarantee.

Effectiveness:

If you have a furry houseguest that you want to keep off of the stove or out of a certain room of your home, you can set up this design to sit right at the scene of the crime to scare them away. Additionally, if you are trying to keep strays from marking areas on your porch or patio, you can set up this unit to keep them away. It emits a silent ultrasonic frequency that is accompanied with a flashing light to scare away your furry house guest to keep them out of certain areas of your home such as the stove or dining room table.

Power:

Because this design can be used indoors and outdoors, it doesn’t have a solar panel located at the top of the unit. It generates power via batteries, but it also comes with an AC adapter so that you can plug it directly into an electric outlet and never have to worry about replacing dead batteries.

Value:

Even though this is one of the smaller options out there on the market, it is also considered to be one of the more expensive designs. While these products don’t typically work on all pets, the Catscram device reports about a 94 percent success rate- which is pretty impressive.

Summary:

If you are looking for a way to send a message to your furry house guest that it is not ok to yak hairballs up on your stove or take long naps on the dining room table, this is an excellent product to send a gentle message to get out.

Effectiveness:

The different frequencies are used to scare away different breeds of critters, but users can tinker and toy with different pitches each night if they find the current setting isn’t suiting their needs. The basic hunter green box has a hanging hole on the back, so you can place it at the point of entry in your backyard, and it will cover about 900 square feet of space. As with all great designs, it also has a large LED flashing light on the front to scare away unwanted visitors 24 hours a day.

Power:

What’s great about this design is that there are a few options to supply power to your unit. While it uses batteries that are charged via a solar panel, users will also have the option of plugging it into a power source using an AC adapter or also by using a USB port- which is something that you don’t find on a lot of designs.

Value:

This is another unit that cost just slightly less than some of the higher-end designs out there on the market. While it isn’t the least expensive that you will find, it is also far from being the most expensive design out there. Plus, Anglink offers a 12-month warranty if anything goes wrong with your product.

Summary:

If you are looking for something that is just a tad more affordable than some of the other designs out there on the market, this is a great choice. Users love that they can control the pitch and frequency of the device, and the added USB charging port is an excellent addition.

Effectiveness:

Past users have found that this design is really effective at scaring away certain unwanted critters, but not others (such as birds and dogs). User has the ability to alter the pitch and frequency of the sound that is emitted and can opt to have the flashing LED light turned on, or they can turn it off as well if they just want something that emits a sound without disruptive lights.

Power:

This unit comes with 3 AA rechargeable batteries that are charged via the solar panel on the top of the device. If you happen to be in the dim light of winter where there aren’t that many sunny days, the batteries will be able to hold a charge long enough to wait for the sun to come out again. It also has an AC adapter port to plug it into an outlet, however, the cables for this are not included with purchase.

Value:

The cost of this unit runs about in the middle of the road. While it isn’t the most expensive design out there on the market, it is far from being the most expensive. The downside to this design is that there is no warranty or product guarantee offered for this design.

Summary:

For those that want to continue to watch the birds come to their feeders, but don’t want to worry about their safety in the face of a hunting predator that views your feeders as an all you can eat buffet, this product will allow you to adjust the frequency to still make your yard bird-friendly.

Effectiveness:

It might be small, but it has dual speakers that can sing. Each unit can cover about 20 feet in front of it at a 110-degree angle. Twenty feet will be adequate if you are looking to deter them from a very specific spot such birdfeeders or certain flower beds, but you may have to employ the use of more than one if you are looking to clear out your entire backyard area. It also has a pair of flashing lights that will render this unit effective 24/7.

Power:

This unit runs off of 3 AA batteries that are included with purchase. These rechargeable batteries can be charged up via the solar panel that is found at the top of each unit. The use of the batteries in addition to the solar panel means that even on cloudy days, the batteries should have enough juice to operate until the sun comes out again.

Value:

What we liked most about this design that it is offered at a very affordable price point that will set you back less than a bag of birdseed. Keep in mind, however, that this unit doesn’t cover as much ground as some of the other designs, so you might have to buy more than one.

Summary:

If you are an ultrasonic skeptic and don’t know if these types of products will be effective, the CO-Z design is a perfect way to test the waters without breaking the bank.

Effectiveness:

Users have found that this design works great at keeping felines from stalking around their feeders or laying on their front porch. It has a dial on the front that will allow users to adjust the pitch of the frequency if they find that a lower pitch isn’t quite doing the trick. Plus, it as a large LED light on the front that will scare away critters in the nighttime as well.

Power:

This unit uses four rechargeable AA batteries that are slowly recharged via the solar panel that is located on the top of each unit. What’s great about this design is that you can also opt to supply power or recharge the batteries via the AC adapter that is located at the bottom (not included with purchase).

Value:

The cost of this unit runs about in the middle of the road. While it isn’t the most expensive design out there, it isn’t the least expensive either. If you are looking for something that runs in the middle of the road, this is a great option. It doesn’t, however, come with any type of warranty if you find that it doesn’t work in your yard.

Summary:

For those that are looking for something that they can just stake in the ground about their feeders or their flowerbeds and forget about it, the VENSMILE design is an excellent, low profile option.

Effectiveness:

Users can opt to either stake this design right into the ground, or they can use the hanging hole to place it on a post. Once set up, it has a range of up to about 30 feet, which is just light higher than units that are similar to this design. Users have found that it is very effective at keeping felines away, and it has a series of dials on the front to adjust the frequency so that you can find the pitch that will clear all those critters right out of your yard. It also has a flashing LED light to utilize light to scare unwanted guests away as well.

Power:

This unit utilizes 3 AA rechargeable batteries that are powered by a solar panel that is located on the top of the unit. What users appreciate about this design is that their low light in winter isn’t sufficient to give the batteries a good change, they can take it inside and charge the entire unit through the DC adapter found on the bottom of the unit.

Value:

This cost of this unit is just slightly higher than many of the average priced designs out there on the market and will set you back about the same price that you would spend on a 25-pound bag of birdseed. The bad news is that this design doesn’t come with a warranty in case it doesn’t work on the felines of your neighborhood.

Summary:

What users love most about the VOLADOR design is that it is small, but it can punch to drive critters away. It’s easy to either stake right into the ground, and the strong weather resistant plastic casing will hold up nicely in all types of terrible weather condition.

Effectiveness:

Users rave that this design works great at keeping felines out of their yard. It simply stakes right into the ground, and it's motion-activated whenever a critter enters your yard. It has a range of about 30 feet that spans a 30-degree radius, which is pretty good for units of this size and cost. It also has a flashing LED light that will scare critters away at night as well.

Power:

This unit is battery powered, and the solar panel that is located at the top of the unit will keep the batteries fully charge when the sun is out. The downside to this model is that it doesn’t have the option of hooking it up to an electrical power source or charging the batteries with anything but the solar panel.

Value:

The cost of this simple unit is priced just slightly below other similar models. It will likely cost you about the same amount that you would spend on a large bag of birdseed.

Summary:

For those that are looking for something simple, easy to use, and incredibly effective, the instecho is going to be your best without breaking the bank.