This compact and lightweight training collar is perfect for field or household use. It offers simple controls and advanced features to accommodate various stages of your dog's training needs. Rugged, waterproof collar fits extra- small to large dogs and is powered by rechargeable NiMH batteries (included). Unit is expandable to handle multiple dogs (up to 3) with the purchase of additional add-on receiver collars. Maxx-Range internal FM radio frequency antenna is woven into the collar. One-hand operation transmitter has 16 levels of adjustable stimulation intensity using the easy, no-look clicking dial. Up to a 900-yard transmission range. Built-in magnetic on/off system. Package includes: transmitter unit, receiver unit with black collar strap, battery charger, simultaneous charging jack, test light, lanyard and user's manual. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Color: Black. Type: Electronic Collars.