The Tri-Tronics Pro 100 G2 EXP allows you to control up to three collars with the purchase of additional receiver collars (only one collar included). This model has 18 levels of continuous stimulation with three intensity options, a separate button for six levels of momentary stimulation, and a tone-only mode. One-mile range. The remote trainer features a small, compact and slim-line design; a no-slip grip on transmitter; a small antenna; and a tough Lexan housing and raised buttons. Remote and collar are 100% waterproof. Button guards prevent accidental activation. Color-coded toggle switch matches collar straps for each dog, Mode A setting is for beeper accessory. The intensity selector dial is designed with precise clicks for clear level setting and can be adjusted by hand or thumbs. On/Off button on the receiver has status LED. Comes with insulated and interchangeable long and short contact points. One-mile range. Rechargeable NiMH batteries recharge in just two hours. Charging cradle has status indicator and automatic shut-off mode. Hard case and instructional DVD included.