Ultrasonic Rodent Repellent for Car Engine – Battery Powered Under Hood Mouse Repeller with Flashing Strobe Light, Keeps Rats and Mice Away from Vehicle, Automobile, Truck, Garage, Attic, Barn, Shed

ours (ZN-509) is utilized beneath the belly of a trike which lives outside under a bike cover & a metal carport when not in use. our bike mechanic discovered a 'nest' (of some sort) fashioned in the compartment which houses the air filter of our trike last winter during annual "winterizing" & regular maintenance. at a loss, we decided to give this gizmo a try since our options are relatively limited. thanks to fellow, kind, community members' reviews, we bought this Loraffe model for the trike situation & another 'big brother' Loraffe for our 10'x12' metal shed out back (the much larger, triangular shaped, "4-in-1" model w/ two speakers & flashing LED's). both products have been used for a month & so far, so good! the one in the shed is plugged in 24/7 & the one on the concrete carport pad beneath the trike (this model above) runs on batteries. we haven't had to replace the batteries yet after 1 month but it's only "on"/ running during the evening & wee hours of morning. i see no indication of any rodent invasion in or around the trike since appropriating this unit about a month ago... again, so far, so good. i like the compact size of this model & might imagine it could impart lots of beneficial uses in a wide variety of places or applicable situations. iow's, it's small & portable & will run w/ standard AA's (3). yes, it's made in China. yes, it comes w/ a 1 year warranty. yes, you must remove the back plate to install batteries b/c that plate is secured by 1 tiny screw (the kit comes w/ a handy, tiny screwdriver + 8 tiny "zip" ties & 2 extra tiny screws). personally, i see no problem w/ this design but ymmv.Conclusion: would I recommend the product (or, Loraffe in general)? so far, absolutely. would I buy again? whelp, hopefully not b/c we hope the two we've already invested in will work as intended/ advertised for years to come. the ZN-509 emits both ultrasonic sounds & LED strobe effect lights which 'cycle' through 5 stages about every 113 seconds. there is both a red indicator light & a beeping sound emitted from the unit (per manual) when low power (<3.3 volts) is reached & batteries need replacing. there are two switches: an On/Off switch and the "Test" switch. that's it. we dwell in the ATL, GA suburbs (for context) in an older subdivision & our property (about 1/2 an acre) is adjacent to about 2 acres of natural, wooded area which also extends around the rear of our property line. we've been here about 17 years & rodents (mostly squirrels & field mice) have been the major culprit of our rodent dilemma. between the Loraffe's, the annual owls & hawks, we're optimistic that that dilemma will prove mitigated once and for all... time will tell.

My girlfriend & I have the older versions on our cars & they work great. We like the newer version because it uses AA batteries instead of C batteries allowing the new one to be shorter in height making it even easier to place it under hood. When car is in motion, unit senses movement and turns off & turns back on when no motion is sensed. There is also a hardwired version available. This product does work.

I have another brand, similar device that needs periodical power reset because it hangs for some reason. This one is much better and I feel works also better. It even helps to get rid of birds out of my tree. 4 stars because it makes loud clicking sound when it starts a series of ultrasound pulses.

I live in an area with lots of squirrels this item proved very effective as a deterrent and was easy to install and was completely noiseless in the engine compartment of my vehicle and was definitely worth the money I spent on it would definitely buy again.

First things first: Deterrents are only as good as the willpower of a rodent. This is more of a low level deterrent. Don't ever expect this as a full proof system.The nature of actually testing this is quite difficult. All I can say is for the past two years I haven't had a rodent incident with my vehicle. It has functionally worked and usually gives me about 3-4 months of battery life. Hopefully it will still work for years to come.

Since I have installed on my car I have not seen any more signs of mice. super easy to install under the hood. I really like the fact it uses AA batteries!! I took a several hour long trip on a hot day, that night i checked to see if it still worked since it is around so much heat under the hood, and it was still working just as it should have been, seems to be built to last.

I’ve been using this electronic repellent in my covered outdoor barbecue to keep mice out. It worked well for one month before it stopped working. Changing batteries didn’t help. I then noticed corrosion on the battery terminals. I scraped the terminals clean and reinstalled batteries, and the repellent worked. If the terminals corrode after one month the manufacturer should improve their battery terminal design.

It has only been under the hood a short while, so haven't seen any more signs of a mouse or rodent so far. The item is as described and easy to find a spot for it under the hood.