1. Built-in USB sound card chip, with high-quality audio input and output.      2. Built-in USB serial chip. E.g. launch control using RTS, receive control using DSR. (ECHOLINK User)      3. The built-in audio detection chip controls the radio's PTT button and outputs the sound to the speakers by the radio-compute-controller.(ZELLO User)      4. The control-software forwards the input-voice of the microphone with the detection of the SQL radio signal from the USB chip(ZELLO User)      5. The USB-Radio Interface is compatible for AllstarLink. GPIO Detect COS and CTCSS input . GPIO outputs and control the PTT (ASL soundcard function).            6. The user's computer will not get Power/RF interference noise from the power supply from radio because the R1 has the optocouplers and the isolating transformer.      7. R1 introduce the of electric conductor or circuit (inductance) to isolate Power/RF interference and high-frequency radiation.      8. Full Metal case, shields all other interference.      9.Industrial design with standard production process.      10. LED status indicators.      Colour:blue      Material:Metal            Package Contents:      1 x R1 controller      2 x USB-D Cable      1 x 6 PIN Cable            Only the above package content, other products are not included.      Note: Light shooting 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.