6-way button guard prevents accidental stimulation and the adjustable collar strap fits all dogs. Both the transmitter and collar are powered by rechargeable batteries, which can be removed and replaced by you. 30-day money-back guarantee / 2-year warranty. 18 levels of momentary stimulation (6 each of low, medium, and high) 6 levels of continuous stimulation Trickle charge mode Extended battery life No stimulation "N" safety position on the transmitter One dual lead charger services the transmitter and the receiver ON/OFF switch activated at the receiver 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 Long and short contact points are included No external collar antenna Adjustable black collar strap with a square double buckle, and metal keeper Rugged foam lined carrying case Removable button guard Basic Training Video and Manual 30 Day money back guarantee