[FM Mode Usuage] In FM mode, plug in earphone and long press the " Memory" button about 2 seconds, it will appear " STEREO" sign. Long press the " Memory" button again, the " STEREO" sign will be canceled, or pull out earphone, the " STEREO" sign will be also canceled. [Button Automatic Backlight Function] The button automatic backlight function is easy to operate at night. Short-wave default step value 0.005MHZ, the default step value of 9KH or 10K, FM default step value 0.05MHZ. [Dual Function] The boot state can be set to mute state and lock frequency function. With the power off the total button, you can prevent the radio from leakage or turn on automatically after shutdown. [Memory Function] The FM radio is low power symbol, charge symbol display. Memory function. It supports MICRO USB connection power supply (Charging cable NOT included). [Alarm And Clock Function] The radio is FM/AM/SW/LW/TV Sound Full Frequency Receiver, with clock and alarm function.