Rechargeable, no need change battery. And soundless design for the suitable and left buttons, won’t disturb others.
LED Light: 7 different color changes randomly even as in use, smooth touch.
Widely Compatibility: Works with Windows 2000/XP/7/8/10/Vista, Mac with USB port.
MANUFACTURER REFUND GUARANTEE: We do our perfect to provide better products. If you are unsatisfied with our product for any reason please contact us, we would be more than pleased to switch your unit or give you a full refund !