Hiyadeal&reg; 4 in 1 Pet Remote Trainer Dog Electric Training Shock & Vibrate Collar for 1 Small Medium Dogs The strong static impulse can penetrate the hair of the pet and fabric within 6mm thick. It is unnecessary to let the discharging point touch the skin of the pet. Therefore it is safe for the pet. The static impulse can quickly and effectively curb the improper deeds of the pet. The warning vibration will let the pet associate the vibration with the static impulse. In the end, vibration will achieve the same effect as the static impulse. 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, its power can be automatically turned on and turned off. Collar is water resistant. Package Includes: 1x Remote Transmitter(with one 9V battery), 1x Collar, 1x Receiver, 2x 1.5V AAA Battery, 1x Test Light,Image - is a registered trademark protected by the US Trademark Law. Image products are sold by authorized sellers