Expandable to 3 dogs with Add-On Collars (Sold Separately), Up to 1800 yard (1 mile) range, Lightweight waterproof collar and transmitter, No-Slip/Soft-Grip transmitter floats on water, 16 levels of intensity, adjustable from the transmitter, Nick and Continuous Stimulations, MAXX-Range Internal Antenna System, Rechargeable Ni-MH Batteries, Gentle Touch Stimulation with lower levels, Built-in safety shut-off system, Available Limited Lifetime Warranty. Box contains: 1 x transmitter, 1 x Collar unit, Standard 120V Charger, Double Jack Splitter Cable, Test Light, Carry Case, Instruction Manual, Basic Training Booklet. Type: Remote Trainers