EX901/EX901D is the normal one. Power supply: 5V DC by four pins power connector or two line connector and Data input/output: RJ45;Physical Connection: Place between sending card and first receiving card. Usually near the led display side.
EX902/EX902D with more 4 power supply connector,1. led display screen Brightness Automatically Adjustment;2. Internal and External Humidity and Temperature Detection;3. Audio Data Output;4. Remote Power Control.
EX903 with Optical Fiber Connection (SFP module: single-mode 20km multi-mode 500m)
When you need to turn on/off the led display or adjust the brigtness automatically, linsn advise you using the EX901D Multi function card.
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