Brand: ULTPEAK

【Dog Barking Control】Sonic are harmless to pets. If the dog is hearing-impaired or aggressive, the device may not work as expected. Using one device against two or more barking dogs at once is not recommended.
【Rechargeable & Durable】The built-in 1500mAH lithium battery can continuously work for 30 days after 5 hours of full charge. Low battery power indication guarantee you charge in time. The sturdy ABS waterproof shell gives the device a longer lifetime and can be put or hanged everywhere indoor and outdoor.
【Effective On Most Dogs】The device works on most breeds and sizes, but not work on deaf or hearing impaired dogs. Some dogs may be afraid or dislike the ultrasonic sound, not stop barking at the beginning. Please allow up to 2 weeks for training.