Educator E-Collar Remote Dog Training Collar Two dog system with 1/2 mile range Small receiver (2"x1.5"x1", 2.4 oz) for dogs 5 pounds and larger Mini ergonomic "stopwatch" transmitter (2.64" diameter x 1.29" thick) is well-suited for small hands or in situations where discreetness is important Delivers a tapping sensation similar to vibration, but more intense, making it an effective addition to the stimulation User-selectable stimulation levels from 1 to 100 with additional boost stimulus selectable from 1 to 60 Includes four sets of contact points (2 x 5/8" and 2 x 3/4") Lithium-polymer rechargeable batteries with quad charger; 2-hour full charge