Waterproof training / anti-bark collar for dogs. It has 3 operating modes: 1) warning the dog with a sound signal 2) vibration (with the option to choose the intensity level from 0 to 7) 3) electric shock (with the option to choose the intensity level from 0 to 7) The sound signal is constantly activated, the remaining 2 modes can be turned on/off independently. The collar has adjustable sensitivity (from 1 to 7, where 1 is the least sensitive and 7 is the most sensitive). Maximum dog neck diameter: approx. 20cm Specifications: power supply: 3.7V 280mAh battery USB charging cable included bulb - tester electric shock function adjustable strap (min. length: 20 cm, max. length: 60 cm) It is recommended to test the electric shock function starting from the weakest intensity level.