The USB charger has 4 slots to charge power for 3.7V Li-ion battery to save time, with charge indicator and over-charge protection. The compatible battery model is 10440, 14500, 16340, 16650, 14650, 18350, 18500, 18650. And 4pcs18650 li-ion batteries included.

Features:
4 slots independent charging, non-interfering.
Dual charge indicator, red light is up when charge, green light is up full power.
Automatically stop after fully charged, do not over-charge.
Compatible battery model: 10440, 14500, 16340, 16650, 14650, 18350, 18500, 18650.
Six protections: over-charge protection, over-current protection, over-temperature protection, short circuit protection, reverse connection protection, over-discharge protection.
Compatible with multiple USB charge devices.
4Pcs li-ion batteries, high discharge efficiency, more than 1000 cycle charge times.

Specifications:
Material: Plastic
Color: Black
Power: DC5V 1-2A
Output Voltage: DC4.2V 1000mA
Battery: 4 x Li-ion batteries, 3.7V 9800mAh
Item Size: 117 * 90 * 30mm / 4.61 * 3.54 * 1.18in
Item Weight: 106g / 3.74ounces

Packing List:
1 * USB Charger with USB Cable
4 * Li-ion Batteries