Features: Experience the convenience of no need solder battery solution with our 4 slot 21700 detachable battery case, to power up your high capacity devices seamlessly. Support low current modes Support fast charging status indication Input overvoltage and undervoltage protections Output overcurrent, overvoltage, short circuit protections, battery overcharge, overdischarge, overcurrent protections, overtemperature protections Specifications: Material:Plastic Number of batteries: 4x21700 batteries Color:Black,White;(Optional) 4x21700 battery power without welding (batteries not included) Double LED high-brightness lighting (press and hold for 3seconds to wakes up the switching) Support 22.5W+15W wireless chargings Support 20W fast chargings Support 22.5W fast chargings Charging current up to 5A, efficiency up to 96% Support two-way fast charging Automatic load detection/light load detection Package Includes: 1pc Power Case (Battery not include) note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.