Contains: (1) 9 Volt Nickel Metal Hydride (NiMH) rechargeable battery and (1) Low profile charger.
The Dual, Low Profile design of this 9V charger makes it a perfect fit to be stored inside your tens carrying case. Charger has 2 charging lights, which only display that the batteries are being charged--it doesn't show when they are charged. This is a trickle charger, it takes about 12 hours to charge a standard 200mA battery. This and all battery chargers must be used with a rechargeable battery only.
Sold separately, $7.95 each.