1. Product model: AD22B04 2. working voltage DC 12V, with reverse polarity protection 3. Operating Current: Standby 11-13 MA, 1 relay "open" 44MA, 2 relays "Open" 77MA, 3 relays "Open" 110MA, 4 relays"open" 140MA 4. eight modes of operation:Non-locking (Momentary ), self-locking (Toggle),-locking (Latch), 5/20/60/120/250-second delay 5. Maximum load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC size:50*80*19.5mm Material:plastic colour:blue Package Contents: 1 * AD22B04 DC 12V 4 Channel DTMF Decoder Relay Board 1 * Male to Male audio wire (3.5mm jack ) Only the above package content, other products are not included. Note: Light 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.