High Tech Pet RC-8 Radio Collar for Humane Contain Electronic Fence Systems and Radio Mat Pet Deterrent Kits Compatible with all Humane Contain electronic fences by High Tech Pet; also works with Radio Mat pet deterrent pads Built-in stimulus test lamp lets you test your boundary field and shock output without using an external test lamp Waterproof sealed speaker transmits sound directly to the outside world for louder, more reliable training tones and faster boundary training Ultra-slim, lightweight comfortable collar is adjustable from 7-inch to 25-inch for all dogs 5-pound and up Short hair and long hair probes included; uses one long-life replaceable battery (model B3V8-1P)