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Model: SJCAM SJ4000 Dual Port Battery Charger Material: Plastic shell Color: Black Dual-slot Camera Battery Charger for SJ4000 Action Cameras. Charge two batteries for SJCAM cameras simultaneously (Batteries not included). Smart LED lights indicate the charging state. Red light shows that the battery is being charged ; Blue light shows that the battery is charged fully, prevents battery from overcharging. The dual-port USB charger have Mini USB port and Micro USB port. Batteries are charged outside of the camera, using any USB power source. Compatible with most standard USB wall charger, USB car charger and computer's USB port.