OtterBox OtterSpot Wireless Charging System Base + Battery Pad 5000mahOtterBox OtterSpot Wireless Charging System Base + Battery Pad 5000mah. Black unit color. Features: Use this charging pad as your base to fast charge Qi wireless devices and simultaneously stack multiple OtterSpot batteries. Goodbye cables and cords. 36 watt base charging pad powers up to two OtterSpot wireless batteries and one device simultaneously Eliminates tangled mess of wires on countertops and nightstands with one stackable charging pad base