1. Add audio amplifier to solve the problem of extremely low SSB single-sideband volume, with obvious effect. 2. Redesign FM and HF bandpass filters, FPC board with IPEX interface, simpler installation 3. Add ESD tube at the input end for electrostatic protection and strong signal protection during dual-antenna UV segment transmission. 4. Use FPC soft board with a thickness of 0.12mm, safe and reliable without short circuit, and installation does not support speakers. 5. Use high-quality high-frequency winding chip inductors with high Q value, low internal resistance and strong filtering selectivity. Dual antenna solution, add an additional level of bandpass filtering at the antenna input The FPC soft board uses a double-sided disk, which is more convenient to connect to the original machine. Applicable models: Applicable to UV K5/K6 The printing/appearance from batch to batch, but it not affect the use; the actual product may have color difference due to different light or display. Colour:Photo Color Material:PCB Package Contents: 1 x Walkie-talkie modification board 1 x 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.