Inland 7" iOS Mini Bluetooth Keyboard (71108) keyboard:7inch,80 keys SIG Bluetooth 3.0 Built-in rechargeable li-ion battery, charged by USB port, controls the charging automatically. Rechargeable Battery USB Charging Lightweight Bluetooth version 3.0, using the Broadcom 20730 main chip, with WIDCOMM BTW Bluetooth software, observes the SIG Bluetooth 3.0 version specification Controls the charging automatically