Features: _x000D_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._x000D_Great for Small/Medium/Large Dogs: The dogs barking control devices effective for dogs of all breed_x000D_3 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._x000D_Rechargeable: The UItrasonic dog barking deterrent is rechargeable. it can full charge within 40 minutes, then works about 2 hours._x000D_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._x000D_Notice:_x000D_1.Actual color may be slightly different from the image due to different light effect_x000D_2.Please allow 1-3cm deviation due to manual measurement_x000D_ Size: 12cm*4.7cm*2.5cm_x000D_Battery capacity: 800MAPackage List:_x000D_1x Ultrasonic Dog Training Devices