Features:-It has 3 adjustable ultrasonic frequency levels including 30KHz for small dogs, 20KHz for docile dogs, and 15/30KHz for large dogs.-Equipped with an LED indicator light, the light will flash blue every 6 seconds when the device is working on 3 frequency levels, a red light will come on for 3 seconds when barking triggers the deterrent, and will also flash red when the battery is low and needs to be charged.-Adopting ultrasonic sound, non-toxic, chemical-free, safe to use, your dog can hear it but will not be hurt.-Built-in 1500mAh rechargeable battery, fully charged in only about 6 hours, can remain on standby for about 60 days depending on the frequency of dog barking.-The device can be mounted on fences, inside your home, in a kennel, on a tree, .
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