The Si500 can be used well with the APX series radio. The Si500 can operate intercom interfaces such as channel, area, and volume, making the interface more intuitive. The P1 and P2 buttons on the side can be used to map the functions of the buttons on the side of the walkie talkie. The voice transmission interface effect is very beautiful. The Si500 has already enabled single mode, wired mode, and Bluetooth wireless mode. As a Bluetooth handheld, the Si500 is excellent. The recording and photo taking functions of the Si500 are also set to CF memory card to save videos and photos, so that individuals can easily copy and delete videos by reading and writing to the CF card, and can easily manage videos without the need for an RM server. The sales kit includes a Si500 host, Si500 battery, Si500 battery cover,  Si500 charging cable and charger, 32G SD memory card，card reader， which can be directly connected to the phone charger to charge the Si500.Si500 sold without accepting returns or exchanges.