Features: 2.4G wireless technology, up to 15m transmission distance, stable connection. No drivers required, plug and play. 3 adjustable DPI(800-1200-1600DPI), easy to switch, accurate positioning, to meet your daily office and entertainment needs. Long press the DPI button for 2 seconds to turn off the light. Ergonomic design, the fits your hand, comfortable to use. It will enter into sleep mode according to your usage, energy saving. Support one-key return to desktop, convenient to use.(Only suitable for Windows system, settings are required on OS to use) Built-in 500mAh rechargeable lithium battery, long endurance time. Specification: Color: Black Material: ABS Connection method: 2.4G wireless Wireless distance: 15m DPI level: 800-1200-1600DPI Operation mode:Opto-electronic Keystroke life: 5 million times Battery capacity: 500mAh Rated voltage/current: 3.7V/18mA System requirement: Windows 98/Me/2000/XP/Vista/Win7/Win8/Win10/ OS or latest Item size: 11.3 * 5.7 * 2.6cm /4.45 * 2.24 * 1.02in Item weight: Approx. 67.6g /2.38oz Packing list: 1 * 1 * Charging cable(25cm) 1 * User manual