Main control chip: STC15W408AS microcontroller, strong processing power FM radio module: RDA5807M, covering the frequency range of 87.5-108MHz, achieving global frequency band compatibility Amplifier: Use AXS2031 digital power chip to ensure high output power and low voltage stability as low as 2.5V Voltage stability: 3.3V boost module maintains the best performance of microcontroller and digital display within the power supply voltage range of 2.5V to 5.5V 30CM universal antenna: can be rotated in any direction to adjust the reception of FM signals, greatly improving the sensitivity of the radio, and can achieve the best reception effect Two power supply methods: for Android USB-5V or 3V dry battery Radio band: FM band Frequency range: 87.5MHz-108MHz Output power: mono 5W Note: Only one of the two power supply methods can be selected The product appearance and printed words may vary depending on the batch, but this does not affect use It's DIY kits, needs to finish by yourself. Specification:B: without shell/A: with shell Colour:As Shown Material:Acrylic+PCB+electronic components Package Contents: 1 x FM Radio DIY Kit(Without 2xAA batteries, you need to prepare them yourself) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.