A 6-way button guard prevents accidental stimulation and the collar strap fits all dogs. Rechargeable batteries that can be removed and replaced by you power both the transmitter and collar. 30-day money-back guarantee / 2-year warranty. New - Trickle charge mode New - Extended battery life New - Louder audible tone in the collar New - No stimulation "N" safety position on the transmitter New - One dual lead charger services the transmitter and the receiver New - ON/OFF switch activated at the receiver New - Field chargeable, Field Charger sold separately Waterproof collar Insulated contact points to ensure consistent and reliable stimulation in the water 1-mile range Instantly change stimulation intensity from the transmitter No external collar antenna Adjustable black collar strap with a square double buckle, and metal keeper Rugged foam lined carrying case Removeable button guard Basic Training Video and Manual 30 Day money back guarantee