1. 16-Bit (24-Bit) Digitally Encoded Audio 2. Single-Mode Fiber optic transmit up to 20km(12.4miles) without Optical Attenuation, Compatible with multimode fiber up to 500m(0.31miles). 3. No EMI, RFI, Talk or Video Distortion and no ground 4. LED Indicators for Instant System Monitoring 5. Plug and play, easy installation. 6. Good ventilation, good heat dissipation 7. Standalone or Rack Mount Applicable environment: 1. Intercom System 2. Public Broadcasting System 3. Intelligent Traffic Monitoring System (ITS) 4. Security system 5. TV care 6. Remote multimedia teaching or campus monitoring 7. TV and telephone conference 8. Long-distance radio and television transmission system 9. Building control system Voltage: AC100-240V Plug Type :EU Plug,it applies to Indonesia, Germany, France, , Italy and so on. Colour:black Material:plasticandmetal Package Contents: 1x Audio Transmitter 1x Audio Receiver 2x Power adapter Only the above package content, other products are not included. Note: Light reflection 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.