Features: Brand new and high quality Working voltage DC 12V. Standby current (all relays closed) 12MA, 1 relay open 40MA, 2 relays open 69MA, 3 relays open 95MA,4 relays open 122MA,5 relays open 149MA,6 relays open 174MA, 7 relays open 198MA,8 relays open 224MA. Enhanced RS485 interface protection (TVS). ''open'' ''close'' ''Momentary'' ''Self-locking'' ''Interlock'' ''Delay'' 6 Commands. MODBUS RTU command, Support 03 06 16 function code. Under the ''Delay'' command ,the max delay is 255 seconds. MODBUS commands can be made serial HyperTerminal (serial assistant) OR ''Modbus Poll'' Enter. Under the MODBUS command mode, it can support up to 64 devices in parallel. The default baud rate is 9600BPS. The baud rate can be selected through jumpers: 2400 4800 9600 19200BPS. Specifications: Size: 145x90x40mm Max load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC Package Includes: 1PC x DC 12V Channel RS485 Modbus Rtu Relay Board note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.