Features:Product model: AD22B04.Workingvoltage DC 12V, with reverse polarity protection.OperatingCurrent: Standby 11-13 MA, 1 relay "open" 44MA, 2 relays"Open" 77MA, 3 relays "Open" 110MA, 4 relays"open"140MA.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. Example: Dial 1 to control relay 1, dial2 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. (For more details, refer to "AD22B04_4channel DTMF controller commands setting manual ").Specifications:Size: as the pictureWeight: 72gMaximum load: 10A/250VAC ,10A/125VAC,10A /30VDC, 10A /28VDC ,10A /12VDCPackage Included:1 x 4 Channel DTMF Tone Signal Decoder Relay1 x cable