1. Working voltage: DC 12V/24V2. (DC12V/DC24V)Standby current (all relays closed) 11MA, 1 relay open 39MA, 2 relays open 67MA, 3 relays open 95MA,4 relays open 121MA,5 relays open 147MA,6 relays open 173MA, 7 relays open 198MA,8 relays open 222MA3. 8 photoelectric isolation Input ports (NPN low level active ), the input and output relationship can be set to associated (default) and non-associated through commands.4. UART serial port protocol, USB_B female interface (CH340 chip)5. USB interface supports Windows(WIN10 WIN8 WIN7 WINXP), Linux and MAX operating systems"Open" "Close" "Momentary" "Self-locking" "Interlock" "Delay" "All Relays Open" "All Relays Close" 8 CommandsTwo kinds of commands: AT command and 8-byte command, the two commands are automatically recognized, no need to switch.Under the "Delay" command ,the maximum delay is 9999 seconds(Only AT command)Maximum load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDCApplication: Remote control, remote measurement system;Wireless meter;Smart Home,Home Automation ,Wiser Home;Access control ;Identification system;Data collection;IT household appliance;Intelligence household appliance;Baby monitoring system;colour: greenMaterial: plasticPackage Contents:1 x Relay Module/1 x Relay Module1 x lineOnly the above package content, other products are not included.Note: Light shooting 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.