Feature: 1. Scroll through long documents or web pages faster and easier with this wheel, same as using your mouse, enjoy unique scrolling experience. 2. It can be used on devices like smart phones, pads with BT function; and for those PC or TV box without BT support, you can use 2.4GHz USB receiver. 3. Supports multi finger functions, a single finger click as left mouse click, two finger click as the right mouse click, double finger drag as the rolling screen. 4. Large compatibility, suitable for Win, for OS X, for Linux, and for Android system. 5. Compact size, easy to carry. With 2 levels brightness backlight, you can use it at night. Specification: Specifications: Product Name: Wireless Keyboard Connect Port: USB2.0 or above Processor (MCU): TLSR8267F512ET48 Transmit Mode: BT4.0 + (RF) 2.4GHz Wireless Technology Power Supply : 700mAh Working Current: <68mA Sleeping Current: 130uA Working Time: 10 Hours (back light on); 46 Hours (back light off) Item Size: 15.6*9*1.6cm / 6.14*3.54*0.63in Item Weight: 127.1g / 4.48oz Color: Black . Package List: 1 * Wireless Keyboard 1 * Charging Cable 1 * User Manual (English) Note: BT connection supports for Win 8 6.0 and above.