Please read the following content carefully. (4M) 2x2M Chip. Multi-system operating software can be flashed, just like a PC terminal can be installed with both iOS and operating systems at the same time, improving the playability of for UVK5 K6 intercom. Dual antenna solution. V5.0 (high-frequency/audio-frequency dual amplification + dual filtering), can only change the dual antenna solution, the modification is simple (one jumper), and the anti-interference ability is stronger. V5.0 upgrade content: 1. The FPC board is equipped with a high-gain, low-noise high-frequency LNA, and no antenna amplifier is required. 2. Using the onboard IPEX interface, the board does not need to solder the feeder. 3. The HF bandpass filter is redesigned, and a pre-selection filter is added to effectively shield external interference. 4. Modification is simpler, only one jumper is required. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Colour:Orange Chip Material:PCB Package Contents: 1 * Module 2 * 2M Expansion Chip 1 * Expansion board 1 * Accessory Kit 1 * Antenna 1 * USB programming cable