The battery chargers can charge rechargeable batteries of different specifications.Suitable for 4.2V Li-ion rechargeable batteries 26650,18650,21700,18500,18350,14650,16650,16340,14500,10440. The DC 4.2V battery charger with LED the red light keep on when the is loaded for charging, and the green light keep on when the is full. Single slot charging, fully charged automatically stop. The USB charger battery adapters are professional designs to insure the great fit and correct operation, sturdy and durable. They are not easy to damage,ensuring a long service life. Product include a total of 4pcs battery chargers, which can completely meet your daily use needs and replacement. Colour Black Input DC 5V 1-2A Output DC 4.2V 500mA Type Batt.