Wall/Travel Charger for LG Optimus G Pro, (at&T E980) - External Dock BL-48TH Battery Charger SUPPORTS DUAL-CHARGING: Charge your spare battery with the cradle and use the USB output to charge the battery in your phone AT THE SAME TIME! USB Port Output: 5.2V 1000mAh. Cradle Output: DC 4.2V 600mAh  50mA. Designed to work with your OEM (original) battery. LED charging light indicator: blue when not charging or charge complete, red when actively charging.