Product model: AD22B04 Working voltage: DC 12V, with reverse polarity protection Operating current: standby 11-13 mA, 1 relay on 44mA, 2 relays on 77mA, 3 relays on 110mA, 4 relays on 140mA Eight working modes: non-locking (instantaneous), self-locking (triggering), interlocking (latching), 5/20/60/120/250 seconds delay Dial 1 controls relay 1, dial 2 controls relay 2, dial 3 controls relay 3, dial 4 controls relay 4; default control command is 1/2,可 be changed to any 1-4 bits. Refer to "AD22B04_4 Channel DTMF Controller Command Setting Manual" for details. Maximum load: 10A/250VAC, 10A/125VAC, 10A/30VDC, 10A/28VDC, 10A/12VDC Typical applications: Home lighting system DTMF remote control switch Smart home/home automation DC 12V LED lighting Fluorescent lamp 12V DC motor Automotive electronics Industrial automation and control Note: Due to different production batches, slight variations may occur Color: As shown in photo Material: Plastic Package Contents: 1 x AD22B04 DC 12V 4-channel DTMF decoder relay board with audio cable Only the above items are included; other items are not included Note: Lighting and display differences may cause slight color variation between the image and actual item. Measurement error allowed is +/- 1-3 cm