Features: 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. The default control command is 1/2/3/4/5/6/7/8. Example: Dial 1 to control relay 1, dial 2 to control relay 2, dial 3 to control relay 3, dial 4 to control relay 4; control commands can be changed any 1-4 bits. Specifications: Model: AD22A08 Working Voltage: DC 12V Size: Approx. 94 x 62 x 18mm/3.7 x 2.44 x 0.7in Maximum Load: 10A/250VAC, 10A/125VAC, 10A/30VDC, 10A/28VDC, 10A/12VDC Instructions: You need two phones, one as a receiver (phone_1), the other one as a transmitter (phone_2); mobile phone_1 connected by DTMF audio cable 3.5MM audio controller (the controller to be powered), and then using phone_2 ( may be a fixed telephone) call the phone_1, phone_1 answered, so that two phone call each other; then dial 1/2/3/4/5/6/7/8 by phone_2 keypad to control 8 relays . Caution: 1. DTMF audio controller must use stable work of DC 12V power supply (recommendations 2A or above the power adapter) 2. Remote control the controller by a mobile phone, the receiver must be the phone with 3.5MM audio interface, the transmitter can be a cell phone or landline 3. As a receiver of the phone must output a sound (not muted), or they will not control relays. Glossary: NO: Normal open COM: Common terminal NC: Normal Connect Relay open: COM connected NO but disconnected NC Relay close: COM disconnected NO but NC connected COM. Non-locking (Momentary ): Dial 1 (2/3/4 is the same), relay 1 "Open", relay close after 1 second delay Self-locking: Dial 1, relay 1 "Open", dial 1 again, relay 1 "off", and so on Inter-lock: 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 "Close" after a time Mode selection: Eight modes of operation, electric iron jumper (picture above) on the pads Wiring diagram: 1 Control 12V circuit, the wiring as shown below. Load "LOAD" can be LED lights, fans, motors, routers, and other 12V equipments 2 DC 1-110V or AC 85-265V circuit, the wiring is shown below. Load "LOAD" can be LED lights, fans, motors, and other kinds of voltage AC and DC equipments. Package Includes: 1 x Relay Module 1 x 3.5mm Audio Cable .