180 DAYS LONG STANDBY: Our dog bark deterrent device is equipped with a durable 1600 mAh battery, 2.5 hours quick charge and up to 180 days standby time. Surprisingly, the dog bark deterrent device is also compact and lightweight, so it can easily be carried around in your pocket or on a keychain, making it an efficient assistant for indoor and outdoor dog training. 100% SAFE AND HARMLESS: Our dog bark deterrent device for dogs from 6 months to 8 years old focuses on attracting your dog's attention by emitting ultrasonic waves that are inaudible to humans, and will not cause any pain or injury to pets or people. Proven by the latest test, the 3+1 training mode of our bark alarm is effective for 99% of dogs, 450% more effective than bark collar which can effectively control your dog's bad behaviors such as barking, digging, biting, chg and so on. 3+1 TRAINING MODES: Our dog bark deterrent device has 3 training modes: sound, ultrasonic and ultrasonic + pulse. The ultrasonic mode emits a short burst or a continuous 8-second ultrasonic blast, you can choose the mode that best suits your dog's characteristics. In addition, our dog bark deterrent device has 2 built-in LED lights that emit a constant police glare and alternating flashing glare for easy training and control of your dog at night or in low light conditions. 2 VARIABLE ULTRASONIC FREQUENCIES: Our dog bark deterrent device offers a fixed ultrasonic frequency of 25 kHz and an adjustable ultrasonic frequency of 25-30 kHz, which is more advanced than the fixed-frequency dog bark deterrent device on the market. The different ultrasonic frequencies ensure that the dog will not get used to a single type of sound, which can effectively help you to repel vicious dogs, control bad dog behavior and maintain the deterrent effect for a long time. 3 ULTRASONIC TRANSMITTERS: Our upgraded dog bark deterrent device is equipped with 3 ultrasonic transmitters, which can send 3 times the ultrasonic sound band with a coverage area of up to 23ft, which is much more effective and wider ultrasonic coverage than the dog bark deterrent device with only one transmitter. Whether you are correcting your dog's excessive barking behavior or guiding him to develop good habits, this dog bark deterrent device can be your right hand.