Donner&reg; 4 in 1 Remote Control Shock + Vibrate Dog Training Collar Help to train dog to active under commands. Can teach your dog sit, hell, fetch, and roll over. Strong static impulse can penetrate hair of pet and fabric within 6mm thick. No discharging point will touch skin of pet. Static impulse can quickly and effectively correct deeds of your pet.Warning vibration let your pet associate with static pulse. 250 meter range. With automatic on/off switch of vibration induction power on collar receiver.