Professional Series 1/2 mile range with waterproof transmitter and collar. No antenna on the collar. Lightweight transmitter can be worn around the neck (lanyard provided) or clipped to you belt with a removable cell-phone style belt clip. "Nick" and "Constant" stimulation selected with buttons. E-Linear progression of intenstiy from very low to very high selected with patented rheostat dial on top of the transmiiter. No jumping between levels. Rechargeable user replaceable Ni-MH batteries. Charger included. Sold in a storage case. 30 day money back guarantee. 6 month warranty.