This charger is designed for rechargeable lithium batteries, including 18650, 10440, 14500, 16340, 16650, and 14650. It features 1, 2, and 4 slot independent charging, with a power supply mode of regular USB power supply. The input voltage is DC 5V 1-2A, and the output voltage is DC 4.2V 1000mA. The product size is 90*30*122mm, and it has six protections: overcharge protection, overcurrent protection, over temperature protection, short circuit protection, reverse connection protection, and over discharge protection. Batteries are not included.