Módulos de interruptor de control remoto decodificador de voz para teléfono de relé DC 12V 8 CANALES DTMF
The majority of smartphones and functions machine are DTMF code. Eight modes of, electric iron jumper (picture above) on the pads. Self-locking: Dial 1, relay 1 "Open", dial 1 again, relay 1 "off", and so on.