1. Add an audio amplifier to solve the problem of extremely low volume of SSB single sideband, and the effect is obvious. 2. Redesign FM and HF bandpass filters 3. An ESD tube is added to the input terminal for electrostatic protection and strong signal protection when transmitting in the UV section of dual antennas. 4. Use FPC soft board, the board thickness is 0.12mm, safe and reliable without short circuit, and the installation does not support the speaker. 5. Use high-quality high-frequency wire-wound chip inductors with high Q value, small internal resistance, and strong filtering selectivity. Colour:Orange Material:PCB Package Contents: 1x SI4732 Board 2x Donut Antenna 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.