Compact battery with wireless charging function and magnetic attachment to the back cover 12/13/14. The device also features a charging function. Ergonomic shape, proximity sensor for automatic charging start, and efficient cooling system enhance everyday comfort of use. For wireless charging of smartphones 8/9/10/X/11, we recommend purchasing a sticker adapter to fully utilize the advantages of the magnetically attachable battery, including its use as an ultra-compact desktop charging station. Lithium polymer battery Capacity: 5000 mAh Number of charge-discharge cycles: at least 500 Wireless charging power: 5W for smartphones, up to 3W for Input and output parameters: 5 2.4 Charging time: up to 3 hours from a 5V 2.1A power source) Automatic charging activation by proximity sensor Efficient cooling system for the charging coil Convenient flip-out stand for use as a charging station Includes cable with connector for battery charging.