Can charge four batteries simultaneously Each slot has a separate monitoring and charging capability Compatible with rechargeable 26650, 22650, 18650, 17670, 18490, 17500, 18350, 16340 [RCR123], 14500, and 10440 Li-ion batteries, Ni-MH batteries, and AA, AAA, AAAA, C Ni-Cd batteries Optimized charging for IMR batteries Three charging modes: CC, CV and Trickle Charge Automatically detects battery type and remaining power Automatically adjusts voltage and charge mode Tri-color LED bar displays charging progress for each battery Designed for optimal heat dissipation With overcharging, overheating, and reverse polarity protection Made from durable fire-retardant, flame-resistant ABS plastic