... and operation device, it can support computer, TV and other portable Bluetooth or RF equipment, the OFN module in this product ... key to wake up. •Built-in rechargeable lithium-ion battery, powered by USB port. •LED indicators. •Low power comsumption, up to 50 ... .2 Built-in 1000mAh rechargeable lithium battery, fully charged stand by 3 months.1.3 Button LED backlight design, dark environment ...