The has adjustable sensitivity and 3 training modes (beep, vibration, ), which are adjustable, gentle is safe, or you can choose the no- mode as needed, which effectively stops barking and not hurt all types of dogs. Intelligent Barking Detection Chip - Intelligent barking vibration detection instead of sound detection chip prevents false triggering. Only your dog's barking can trigger the collar, while the barking of other dogs nearby not trigger the collar. Rechargeable and Waterproof - Built-in USB rechargeable battery, which can be fully in one hour and can be used continuously for 25 days on a full charge. Now you can walk your dog anytime because the waterproof device works effectively even in wet weather, but it is not suitable for swimming. The anti- barking collar is adjustable and suitable for dogs weighing 15 to 150 pounds and neck sizes of 0 to 25 inches. Adjust the strap according to the size of the dog. There may be slight color difference or difference in the actual product Colour:As Shown Material:plastic+Electronic component Package Contents: 2 x Pet Training Collars Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.