Radio FM with digital display Do self-assembly, soldering. Wireless radio based on RDA5807 chip with frequency reception in the range FM 87.0MHz-108.0MHz Radio operates on frequencies: FM 87.0MHz-108.0MHz Active and Passive Audio Output Foldable dedicated radio antenna max 25cm and 4 Bit red digital display led. Power supply: DC 3V/5V Output Impedance: 8ohm Output Power: 0.5W Output Channel: Mono Frequency Accuracy: 0.1MHz8 Radio Size (Assembled):107 x 70 x 23mm Instruction: Switch the two-position switch to turn the working power on/off. Press V or V- to adjust the volume. 15 volume levels. You adjust the volume by holding down the button. Press F or F- to adjust the receiving frequency or FM station. Potentiometer: is used do volume control with a screwdriver. Instructions pod QR code or link: The systems have a printed mounting diagram on the tile. You need to pay attention to polarity in the case of such elements as capacitors, diodes, transistors. In the case of Led LEDs, the longer leg is plus , most of the elements ma described parameters on the housing. Resistors can have strip markings of their resistance and tolerance can be read using calculators available on the Internet or measuring with a meter.