Built-in lithium battery ultra-thin lovely silent blu-ray wireless mouse(random color) Operating voltage: 3.7V. System Support: Windows2000 / ME / XP / Vista / Win7 / 8 / MacOsX [Apple] / LINUX [Android] Built-in power indicator light, to facilitate the timely charge.4 rechargeable wireless mouse function keys Free for code design. Can not afford to code, without interference.Ergonomic mouse, prevent the mouse hand. Size: 110mm * 60mm * 20mm.Weight: 78g.