Features: Dog Training and Barking Control Devices -The ultrasonic dog barking control devices can correct dog's bad behavior . Ultrasonic frequency is 20-30 KHZ , it can grabs your dogs' attention , 100 safe for dogs.Great for Small/Medium/Large Dogs: The dogs barking control devices effective for dogs of all breed3 in 1 Dog Training Barking Control Devices: the bark control device has 3 modes. Sound Ultrasonic and Flash light.You can starting with sound mode first, if it no effect,then try to 'ultrasonic 'or 'flash light'mode.Rechargeable: The UItrasonic dog barking deterrent is rechargeable. it can full charge within 40 minutes, then works about 2 hours.Convenient Portable: The anti barking device is small. It perfect for in the hands,and comes with an anti-static wrist strap. And you can carry it in your pocket.Notice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurement Description:Size: 12cm*4.7cm*2.5cmBattery capacity: 800MAPackage List:1x Ultrasonic Dog Training Devices