TEF6686 Plus full-band finished radio3.2 inch large screen. Dual speaker stereo! Strong anti-interference! PCB double-sided full copper! The pcb case is sturdy and durable.Latest firmware: 1.15There is no save function.Increase the voltage display (please pay attention to charging below 3.3v) the charging voltage is 5vIt is not recommended to update the flash firmware by yourself.(Remove the 6 hexagon socket screws in the rear case and use an M3 hexagon screwdriver to disassemble)Brush(1. Hold the boot button of the motherboard 2. Insert the typec data cable and connect to the computer. 3. Turn the power-on knob to power on)Use the corresponding software to flash the firmware of the host computer. Disconnect the data cable after successful flashing. Reboot. Brush is complete!Chinese translation of system settings:-Volume (audio level)A converter offset (local oscillator frequency of any converter used)A low frequency band edge (lowest frequency that can be selected)- High frequency band edge (highest frequency that can be selected possible)A level offset (signal table deviation due to cable loss or antenna amplifier/converter gain)- Stereo sp. threshold (adjust channel separation if signal strength is below this)- High chamfer frequency (cutoff frequency for high points of low signal strength)A high cut threshold (belonging to the previous option, this is the signal value below which should activate the previous option)A low level threshold (if the signal becomes very weak, the data crosstalk of the whole circuit can be heard in the sound. With this option you can delay the data stream of low signal strength, ideal for DX)- Display Brightness (TFT Contrast)SMA Male Inner Pin AntennaIt is recommended to use with lna amplifier when the outdoor signal is weakMedium wave, short wave, FM.5000MAH lithium battery.Size:115x106x20mmWeight:334g