Upgrade content: 1. Add audio amplifier to improve low SSB single-sideband volume with noticeable effect. 2. Redesigned FM and HF bandpass filters, FPC board with IPEX interface for simpler installation. 3. Added ESD protection at the input for electrostatic and strong signal protection during dual-antenna UV segment operation. 4. Uses 0.12mm thick FPC soft board for safe and reliable installation without risk of short circuit; does not support speakers. 5. Equipped with high-quality high-frequency wound chip inductors featuring high Q value, low internal resistance, and excellent filtering selectivity. Dual antenna design with additional bandpass filtering at the antenna input. FPC soft board uses double-sided pads for easier connection. Compatible with K5/K6 models using S14732 soft board FPC, featuring dual filtering (pre-filter/bandpass) and dual amplification (high-frequency/audio). Applicable models: UV K5, UV K6 Material: ABS Color: As shown Package Contents: 1 x Walkie-talkie modification board Note: Other items not included. Lighting and display differences may cause slight color variations. Measurement tolerance: +/- 1-3 cm.