External Signaling Relay
Used to activate an external doorbell, buzzer, or signaling device when a call is received. It can be used for call extension on the LEF and TD-H Series systems.
(2 Available)
External Signaling Relay
Used to activate an external doorbell, buzzer, or signaling device when a call is received. It can be used for call extension on the LEF and TD-H Series systems.
(2 Available)