Features:With 7-level sensitivity adjustment, it is an efficient behavior modification tool that will help you train your dog to bark less.Can be easily charged with the USB cable.It's tinier, lighter and comfortable for dogs.Whether your dog is a small dog or a large dog our adjustable dog bark collar can fit them just fine.The collar is waterproof, no worry to use it even in rainy day.Specification:Condition: 100%Brand NewMaterial: Plastic+NylonSize: Approx.6.7*4*3cm /2.64*1.57*1.18inBattery: Built-in 300mA lithium batteryCharging Method: USB chargingAdjustable Diameter Range: 6-36cmVoltage: DC 5VPet Size: All SizeWeight: 78gColor: BluePackage List:1* Dog Training Collar1* USB Cable1* ManualNotice:If the dog's hair is too long, it is recommended to cut it short to avoid affecting the vibration of the product.Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering.Please understand that colors may exist chromatic aberration as the different placement of pictures.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.