•The same as the mouse, you can use this wheel to scroll through long documents or web pages faster and more easily, enjoying a unique scrolling experience •It can be used on smart phones, tablets, TV boxes and other devices with BT function; for PCs or TV boxes that do not support BT, it can use a 2.4GHz USB receiver •Multi finger function is supported. One click is the left mouse button, two clicks are the right mouse button, and two drag fingers are the scrolling screen •Strong compatibility, suitable for windows, Mac OS, Linux, smart TV and Android systems •Small size, easy to carry •With level 2 brightness backlight, you can use it at night •Note: BT connection supports Windows 8 6.0 and higher version Specifications: •Brand name: RII •Product No.: I4 •Product Name: Wireless Keyboard •Connection port: USB2.0 or higher •Processor (MCU): tlsr8267f512et48 •Transmission mode: bt4.0 + (RF) 2.4 GHz •Power adapter: 700 mAh •Working current: < 68ma •Sleep power: 130ua •Working time: 10 hours (backlight on); 46 hours (backlight off) •Item size: 15.6 * 9 * 1.6cm / 6.14 * 3.54 * 0.63 inch item •Weight: 127.1g/4.48 oz Package included: •1 x RII I4 Wireless Keyboard •1 x Charging Cable •1 x ​User Manual (English)