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 , 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:blueMaterial:MetalPackage Contents:1 x R1 controller2 x USB-D Cable1 x 6 PIN CableOnly the above package content, other products are not included.Note: Light 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.