... Laser Pointer Combo have 70 keys ,built-in lithium-ion batteries support 2,000 hours of standby time, is ... key to wake up. Built-in rechargeable lithium-ion battery, powered by USB port. LED indicators. ... Pointer Combo have 70 keys ,built-in lithium-ion batteries support 2,000 hours of standby time, is ... key to wake up. Built-in rechargeable lithium-ion battery, powered by USB port. LED indicators. ...