Features:

• Sleek, streamlined comfortable collar -- 30% smaller and lighter than other containment receivers.
• Innotek's exclusive ReadyTest(TM) produces a brief pleasant clicking from the collar to assure you of perfect collar fit, and indicates the system status and battery status of the receiver collar.
• Waterproof -- Collar and transmitter stand up to rough punishment, even submerged in water.
• The new, rechargeable lithium ion batteries charge in only two hours and maintain their charge for weeks at a time.
• Patented Run-Through Prevention (correction level automatically increases as your pet approaches the boundary) and timeout between corrections help your dog learn limits quickly and safely.
• Kit includes 500 ft. of single-conductor ground wire to enclose up to 1/3 acre (expandable to 25 acres with wire kits, sold separately), indoor wall-mounted transmitter with audible and visual wire break alarm (has a built-in 24/7 battery backup in the event of power failure), one rechargeable collar receiver with neckstrap, boundary wire, training support 800 number, complete installation instructions, DVD, training flags, and accessories.
• Recommended for pets 6 months or older.