This is the DTMF audio controller with four channels, any phone or fixed telephone with DTMF key code remotely controls product relay open and close
The majority of smartphones and functions machine are DTMF code
Working voltage DC 12V,with reverse polarity protection
Standby 11-13 MA, 1 relay open 44MA, 2 relays Open 77MA, 3 relays Open 110MA, 4 relays open 140MA, 5 relays open 170MA, 6 relays open 197MA, 7 relays open 223MA, 8 relays open 247MA
Eight modes of operation, Non-locking (Momentary ),self-locking (Toggle),inter-locking(Latch), 5/20/60/120/250-second delay
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