The PowerCase was designed with the ski slopes in mind. Slip your device in at the bottom of a run and it&';ll charge up while you&';re in line and on the lift. Your X1 PRO or PROMAX will automatically go into sleep mode so you can get flying again immediately. What&';s in the box: 1 - PowerCase1, 1 - Charging Adapter Removal Tool 1 - Charging Adapter 1 - Detachable Strap Key Features Equivalent to 12,000 mAh, two and half additional charges. Optimal operating temperature < 20AdegC (-4AdegF). Not recommended for use over 30AdegC (86AdegF). Easy slip-in design for protection and charging. Supports X1 PRO/PROMAX&';s instantaneous wake-up from sleep-mode. Includes a detachable strap for charging on the go. Supports X1 PRO/PROMAX&';s instantaneous wake-up from sleep-mode Compatible with HOVERAir X1 PRO and HOVERAir X1 PROMAX