Do you feel helpless and annoyed when a dog barks uncontrollably? "Do you wish your dog disturbed the neighbor's sleep when you sleep at night? "Our anti-bark devices at ultrasound is designed to solve this problem for you. "With CE/FC/RoHS certification, you can choose our charging dog bark control device without worry. -- Specification-- -Product Name: Bark Control Device -Power Supply: USB -Input voltage: 3.7 V -Input current: 40 mAh -Battery: 3.7V 1500mAh -IP rating: IP4 -Sensor: Sound detection -Sensor distance: up to 33 ft -Ultrasonic frequency: 15KHZ-30KHZ -- Functionality -- 1. SAFE AND EFFECTIVE: Anti Bark Device is an innovative solution for dog barking and unwanted behavior correction. Ultrasonic dog trainers are safe and effective for all types and sizes of dogs (5-120 lbs). Suitable for dogs from 6 months to 8 years old. 2. Wide Working Range: This 2021 new version ultrasonic is convenient for outdoor use with 33 feet control range, the dog barking deterrent device is great for stopping neighbors dogs or homeless dogs that bark near your home and create a quiet living environment for your family. 3. 30 days working time This bark control device only needs 5 hours to fully charge and can work 30 days, standby time: 60 days --Package includes-- 1 x Anti-Bark Device 1 x USB Cable 2 x Mounting Screws and Anchors 1 x User Manual