12V 8Channels DTMF Audio Decoding Relay /Smart Home Controller /Remote Control Module

Product Features
This is a DTMF audio controller with four channels, any phone or landline remote control product relay with DTMF key code on and off.
Most smartphones and feature phones are DTMF codes
Operating voltage DC 12V with reverse polarity protection
Standby 11-13 MA, 1 relay opens 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 Relay opens 247MA
Eight operating modes, non-locking (instantaneous), self-locking (switching), interlocking (latching), 5/20/60/120/250 second delay
product description

Working voltage: DC 12V
Size: 94 * 62 * 18mm / 3.7 * 2.44 * 0.7in
Maximum load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC

Description:

You need two mobile phones, one as the receiver (phone_1) and the other as the transmitter (phone_2); the phone_1 is connected to the DTMF audio cable 3.5MM audio controller (the controller is powered on), then use phone_2 (may It is a fixed telephone. Call phone_1, phone_1 to answer, let the two phones talk to each other; then dial 1/2/3/4/5/6/7/8 through the phone_2 keyboard to control 8 relays.

caveat:

1. DTMF audio controller must use stable operation of DC 12V power supply (recommended 2A or above power adapter)
2. Remotely control the controller through the mobile phone. The receiver must be a mobile phone with a 3.5MM audio interface. The transmitter can be a mobile phone or a landline phone.
3. Since the receiver of the phone must output sound (not muted), they will not control the relay.

Glossary:

NO: Normally open

COM: public terminal

NC: Normal connection

Relay open: COM connects NO but disconnects NC

Relay closed: COM disconnects NO but NC connects COM.

Non-locking (instantaneous): dial 1 (2/3/4 is the same), relay 1 "opens", relay turns off after 1 second
Self-locking: dial 1, relay 1 "open", dial 1, relay 1 "off", and so on
Interlock: Dial 1, relay 1 "open", other relays "off"; dial 2, relay 2 "open", other relays "off", and so on
"Delay": dial 1, relay 1 "open", relay 1 "closed" after a period of time