"Dog-Friendly Anti Barking Device - Your Best Choice for Quiet Environments! Easy to operate, just turn on the on/off button to select the intensity of the mode. The shell material is waterproof and durable, and capable of easily coping with outdoor rain and snow. Anti Bark Dog can be used indoors and outdoors, no electric shocks, no irritating odors, no beeping, safe for humans and pets. Instructions for Use: - Standby: Blue light blinks every 6 seconds. - Work: Red light stays on for 3 seconds - Low battery: red light starts blinking 3 Adjustable Frequency Modes: - Mode 1 (Audio): 10-16 KHZ for small or sensitive dogs - Mode 2 (Ultrasonic I): 20 KHZ for gentle or medium sized dogs - Mode 3 (Ultrasonic II): 25 KHZ for naughty or large dogs Package Contents: 1 x Anti Barking Device 1 x USB Cable 1 x User Manual Warm Tips: The maximum effective detection range of the device is 33FT. The smaller the range, the better the results. The power of the anti barking device for dogs may be consumed during transportation, please fully charge it before use. We recommend this product for dogs between the ages of 6 months and 8 years, it may not work well if the dog is hard of hearing or aggressive. 3. On hearing this high-pitched sound, the dog immediately stops barking, as it will associate its bark with this unpleasant noise. When the dog stops barking, the ultrasonic sound also stops. 4. Some dogs don't like the sound, and it may bark more violently at the device. At this point, don't turn off the device, keep it running, and give the dog a two-week acclimation period, and it will stop barking because the dog is smart enou" DIRECTIONS 1. Use the ultrasonic sound to deter dog barking and the microphone will pick up the ultrasonic sound, the device is automatically activated. The sounds only can be heard by dogs and are silent to humans. 2. Use the Low level Mode if the dog does not respond, then adjust the device to another level. 3. Level 1 (15KHZ-30KHZ) applies to the large, naughty dog. Level 2 (20KHZ) applies to the docile dog. Level 3 (30KHZ) applies to small dog.CHARGING & PORTABLE - This ultrasonic bark control device works for up to 30 days after 5 hours of charging. The shell material is lightweight and portable, and there is no need for any other complicated operations, just choose one of the desired modes. You could set it up in a tree, kennel, table or wherever you find it convenient to use. You could also take it with you when you are outdoors. IP45 WATERPROOF PROTECTION - This dog barking deterrent is made of IP45 material with waterproof housing, you don't need to worry about the weather factor during use. For some sudden weather conditions such as rain and snow, the professional waterproof design allows the barking dog silencer still to work normally, freeing your hands and bringing you great convenience. SAFE FOR DOGS AND HUMANS - Ultrasonic dog bark deterrent is harmless to pets and completely inaudible to the human ear. The anti bark device for dogs will stop dogs from barking by automatically emitting ultrasonic waves, once the dog stops barking, the ultrasonic bark controller will automatically stop emitting ultrasonic waves without impacting humans or other pets. 3 ADJUSTABLE FREQUENCY OPERATION MODES - There are three modes of the dog barking control devices. The first mode is an audio mode that emits a variable frequency of 10-16 KHZ for small or sensitive dogs. The second mode is the first level ultrasonic mode, which emits 20 KHZ and is suitable for tame or medium sized dogs. The third mode is the second level of ultrasonic mode which emits 25 KHZ and is suitable for naughty or large dogs. BARKING STOPPER FOR ALL TYPES OF DOGS - The dog bark deterrent devices utilize the latest ultrasonic technology to intervene barking for all breeds and sizes of dogs. When the anti barking device detects a dog barking, it automatically emits a gentle ultrasonic wave that quiets the dog. Perfect for when you want your dog to be quiet while you stay away, creating a quiet environment for your family and neighbors.