for samsung galaxy tab a 10.1t510 / t515 split bluetooth keyboard case

- built-in rechargeable li-ion battery built-in lithium polymer battery capacity: 150 mah voltage: 3.7-4.2 v power charge connector input: micro usb charge 5v removable bluetooth 3.0 abs keyboard keyboard standby time: 30 days approx continual working time: 55-70 hours charging time: 1.5-2 hours operating temperature: -20 ~ 40 degrees celsius working distance: < 10 m buttons use times:5 hundred million times