INTERCOM ADDITIONAL REQUIREMENTS SEE OBS COMMERCIAL REFERENCE INDUSTRONIC-16-DT-705 OBS: – FREQUENCY 300 TO 7000 HZ; – DEGREE OF PROTECTION IP-40; – VOLTAGE 42 TO 72 VDC; – DIMENSIONS 212 MM X 265 MM X 89 MM; – 1 KEYBOARD; – COLOR WHITE GRAY RAL 9002; – MICROPHONE ROD WITH 300 MM; – SPEAKER WITH 5 W / 8 OHMS; – 1 W AMPLIFIER POWER.