4Ch 12V RS232 Relay Board UART Control Switch

1 This is 4 Channel Relay Module 2 DC 12V power supply (voltage range 9-13v) 3 Standby current (all relays closed) 18MA, 1 channel relay open 50MA, 2 channel relays open 81MA, 3 channel relays open 110MA, 4 channel relays open 141MA 4 RS232 DB9 female interface 5 "Read", "open", "close", "Self-locking" , click, interlock 6 commands, can satisfy most of the industrial control

What's in the box
1 x Relay Board