Esky 4in1 Dog Training Shock and Vibration Collar This multi-function(4 in 1) training collar is a combination of:Vibration + Static Impulse + 3-Level Whistle + LED Light The static impulse can quickly and effectively curb the improper behavior of the pet. Both the static impulse and warning functions are set with automatic stop. This is for not reprimanding the pet continuously. With the vibration induction power switch in the collar receiver, it will turn on and turn off automatically to save power. Water resistant Collar