The D-3004S is a 4-channel simultaneous charger for V-mount batteries, with 1 channel discharging function. It will self-identify Li-Ion / Ni-MH batteries, and launch the compatible charging program. The 4-level LEDs indicate the charging status of each channel. D-3004S is compatible with Sony and SWIT V-Mount batteries, including Li-ion, Ni-MH and Ni-Cd batteries, and can clear the memory effect of Ni-Cd batteries.