GoldX 2800 mAh Power Vault One Emergency Backup Battery for Portable Devices This Model Features a 2800 mAH Design and is Silver in Color Rechargeable Battery Through USB Recharges ANY Portable Device with USB Connection Features Quick Charge Circuitry(Apple) Special Designed Quick CHarge Cable 4x Faster Than Through USB Port 2x Faster Than Through a Wall Charger Holds More Than 85% of the Charge for up to a Year Compact and Lightweight/UL