1 Product model: AD22B04 2. Working voltage DC 12V, with reverse polarity protection 3. Operating current: standby 11-13 MA, 1 relay "on" 44MA, 2 relay "on" 77MA, 3 relay "on" 110MA, 4 relay "on" 140MA 4 Eight working modes: non-locking (instantaneous), self-locking (triggering), interlocking (latching), 5/20/60/120/250 seconds delay 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; the default control is 1/2 / the control can be changed to any 1-4 bits. (For more details, please refer to "AD22B04_4 Channel DTMF Controller Setting Manual"). 6. Maximum load: 10A/250VAC, 10A/125VAC, 10A/30VDC, 10A/28VDC, 10A/12VDC Typical product applications: system DTMF remote control switch Smart home/home automation DC 12V LED lighting Fluorescent lamp 12V DC motor Fluorescent lamp Automotive electronics Industrial automation and control Note: Due to different production batches, there may be slight differences in products. Colour:Photo Color Material:Plastics Package Contents: 1 x AD22B04 DC 12V 4-channel DTMF decoder relay board W/ audio cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.