Brand Name: YASOKO Battery Included: Yes High-concerned chemical: None Origin: Mainland China Model Number: QTC49154M Battery: 4000 mAH Rotating speed: 51000 RPM Interface: TYPE-C Gear: 3rd gear Charging time: 3-5h Input power: 5V 2A Product weight: 310 g Box Size: 17*10.5*6.9 cm Color: Black Application: PC/ Keyboard /Crumbs/computer Choice: yes