Lava Electronics SP207 QPets 4 in 1 Remote Training Collar for Small/Medium Dogs Two pairs of metal prongs (Short / Long) to suit dogs with varies fur length. Hand held easy to use remote control works up to 200 meters away. The strong static impulse can penetrate the hair of pet and fabric within 6mm thick The static impulse can quickly and effectively curb the improper deeds of the pet. The warning vibration will let your pet associate the vibration with static impulse