●Wireless and Silm: working distance up to 10M, ultra-slim design. ●Rechargeable, no need change battery. And soundless design for the right and left buttons, won’t disturb others. ●LED Light: 7 different color changes randomly while in use, smooth touch. ●Widely Compatibility: Works with Windows 2000/XP/7/8/10/Vista. ●MANUFACTURER REFUND GUARANTEE: We do our best to offer better products. If youre unsatisfied with our product for any reason please contact us, wed be more than happy to replace your unit or offer you a full refund !