6V DC - Use SKK-620 or 4 "C" Batteries
Door calls in with 2-tone chime, not adjustable, press TALK button to reply, release to listen, power automatically shuts off circuit
Contact rating: 50V AC @ 1A
Door to master: 2-cond., overall shield Between masters: 2-cond., overall shield
Door to farthest master: 245’(22AWG) 490’(18AWG)
Aiphone #822202 or Aiphone #821802
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