The Sport Combo G3 has many of the same features as the G3 Sport Basic, just with more stimulation levels to choose from. The new G3 transmitter is waterproof & ergonomic with a tough, ribbed overmolding and a compact fixed antenna. The Sport Combo features 20 levels of momentary & continuous stimulation plus a tone feature. The waterproof receiver has a built-in on/off button & battery status LED. It runs off rechargeable, replaceable NiMH battery pack. The transmitter runs off a 9-volt battery. All batteries are included. Once receiver is included, but the transmitter can control up to three collars by adding extra EXP receivers. 1/2 mile range.