Cellet Universal Micro USB Emergency External Battery Charger - Black (1500mAh) features Compact size convenient for storage and travel. Quickly and efficiently charges cell phone battery. Includes status button to show remaining battery power. Backup battery capacity LED indicator. 1500mAh high-capacity rechargeable lithium-ion battery. Output: 5V, 500mA. Pass-through charging allows the Backup Battery and phone to charge simultaneously. Recharge Backup battery with your existing phone charger. Compatible with cell phones and devices equipped with a micro USB charging port. Color: Black Type: Battery Compatible Phone Manufacturer: Universal