Full-band finished radio 3.2Inch large screen. Strong anti-interference! PCB double-sided full copper! The pcb case is sturdy and durable With voltage display (please pay attention to charging below 3.3v); the charging voltage is 5v Antenna with SMA male connector Medium wave, short wave, and FM Upgrades: 1. The system firmware flashing method is updated to any flash mode. Connect your computer and turn on the radio switch to flash any suitable system firmware at will. 2. Upgraded to a more powerful audio chip. The sound mode has been upgraded to a single speaker with a passive diaphragm. The dual-speaker version is a specially customized version. 3. Continue to improve the compatibility of the body case and motherboard. 4. Improve the test method before encoder welding, and fix the problem that the encoder is stuck and freezes the system interface. 5. Enhanced antenna eliminates root breakage. 6. Charging indicator: red light will turn on when it is charging and green light will turn on when it is charged Flash Firmware: (1. Hold the boot button of the motherboard. 2. Insert the type-c data cable and connect to the computer. 3. Turn the power-on knob to power on.) Use the corresponding software of the host computer to flash the firmware. Disconnect the data cable after successful flashing. Reboot. It is finished. 5000MAH lithium battery Size:115 x 106 x 20mm/4.5 x 4.2 x 0.8Inch Weight:334g/0.7lb Color:As Shown Material:Plastic+Metal Package Contents: 1 * TEF6686 Full Band Radio 1 * Antenna 1 * English instruction manual