Brand RII Model RT-MWK25 Quantity 1 Color Black Material Plastic + silicone keyboard Key Numbers 44 Connection Method 2.4G Wireless Power Supply Built-in rechargeable battery Battery Capacity 450mAh Supports System Windows 2000 / Windows XP / Windows Vista Windows CE Windows 7 Windows 8 / Linux (Debian-3.1 Redhat-9.0 Ubuntu-8.10 Fedora-7.0 tested) / Android OS (With standard USB interface) Other Features Receiver: Nano style; Interface: USB 2.0 2.4GHz wireless transmission mode; Transmission range up to 10m; Transmission power: Less than 4dB; Charging voltage: 4.4V~5.25V; Charging current: 300mA; Sleepy mode current: Packing List 1 x Air mouse 1 x Receiver 1 x Data cable (80cm) 1 x English user manual