Collars haven’t been used in a while but worked the last time tested. In full disclosure, we had difficulty getting the second collar (shorter set collar) to connect to the remote properly. Set comes with two collars, remote control, and charging cable. Description from Amazon: This dog training collar contains 2 receivers, you can control two dogs with one remote simultaneously PATPET dog shock collar offered customized Static Shock (1-16 levels) and Vibration (1-8 levels) and Beep mode The working time of the remote is up to 66 days, the receiver is 11 days. Full charge only 2 hours 1000Ft control range and IPX7 waterproof receiver provides your pets with maximum flexibility during outdoor and underwater activities The 27 inches adjustable nylon collar fits for small medium large dogs for 15 to 100 lbs