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Features: 1. Power Source: DC 9~30V 2. Signal Input Interface: a. RS-485*4 b. 4-20mA*4 c. 1 Wire* 4 d. I/O* 4 3. RF Interface: 3.5mm SMA Female connector (ANT) 4. RF Band: 2.4G ISM Band or Quad band: GSM
