1. Using FPC 0.2mm thin board, compared with the traditional fiber thick board PCB, it reduces the parasitic inductance to the ground. And the speaker is not installed on top.<br> 2. Using the on-board interface, the board does not need to solder the feeder. In addition, the top ground wire has a welding hole on the right side of the fixed position. The soldering iron can be soldered firmly with a light touch, which greatly reduces the difficulty of installation and construction.<br> 3. transient suppression diode is added to suppress transient voltage, and the parasitic capacitance of the protection component itself the impedance matching during the original-signal transmission, preventing the signal from being distorted.<br> 4. The internal amplifier circuit IC uses components with a maximum signal gain of 19dB. There is no need to use an external active antenna like the old version. Only an ordinary pull-rod antenna is needed to obtain good reception performance. (Not included)<br> 5. Add an audio amplifier circuit to solve the problem of low volume of SSB single-sideband in CEC English firmware.<br> SI4732 V6.8 Upgraded version! ! !<br> FM (frequency modulation) and HF (amplitude modulation medium and short wave) bandpass filters are added to the adapter board, which has stronger anti-interference ability.<br> High-quality high-frequency winding chip inductors are , with high Q value, small internal resistance and stronger filtering selectivity.<br> The soft board FPC uses a non-glue substrate, and PI is divided into two types: glue substrate and non-glue substrate. This product uses a non-glue substrate, which is more to high temperature and has a longer life.<br> The cost of using immersion gold process is higher than that of traditional tin-plated plate, which has higher reliability and stability in conductivity and oxidation resistance.<br> The components are soldered by machine, which has a higher yield rate than traditional manual soldering, and has less thermal damage to FPC soft board and components, greatly improving the service life.<br> Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use.<br> Colour:Orange Yellow<br> Material:FPC<br> Package Contents:<br> 1 * Module with Accessory Kit<br> 2 * 2M Expansion Chip(factory serial number depending on the batch)<br> 1 * Adapter board<br> 1 * Antenna<br> 1 * Frequency Writing Cable (printing depending on the batch, but it does not affect the use)<br> Only the above package content, other products are not included.<br> 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.