The Twin V Pro is a high end fast charger for Lithium Ion Digital SLR Camera Batteries. Supplied with a 12v lead as well as a mains adapter, the Twin V Pro can be used at home or while on the move. Fast charger for 1 or 2 lithium ion batteries. 2 charge control systems with 2 LCD Displays 1 for each battery Charge time approximately 1 to 2 hours, depending on battery Variable charge current battery overheating protection depending on battery capacity Twin V Pro converts to a battery tester when power is not connected. Interchangeable battery contact plates, allowing the charging of different Li-Ion batteries from different SLR Cameras. Modern style housing with slide-out charger cover, turning into a stand-up charger support. Suitable for the Olympus E400,E300,E330,E500, Pentax K10D