Easy-to-read LCD screens; side buttons for dog selection & training level; front buttons for 18 correction levels, momentary / continuous, tone and/or vibration. Waterproof in one meter water up to 30 minutes; transmitter floats. Rechargeable lithium-ion batteries. Expandable to 3 dogs. Black strap, charging clip, USB cable & AC charging adapter. Basic Delta has a 1/2 mile range and 3 correction configurations. Delta Sport has a 3/4 mile range, 5 configurations. Built-in Bark Limiter. Free shipping (UPS Ground).