Power source: DC24V / 1.2A (power from interphone); Consumption: Un Load ; 0.3W In Load ; 1.0W; No of wires: 4 wired parallel (voice, calling, power,GND); Range: TIV 0.6 (1Km) * when additional DC 24V adaptor is installed); Multiple Intercom Unit KIP-605 & KIP-611en