Feature: 1. Work Association Pattern: Input output relationship can be set to self locking in default, interlocking, momentary, output equals input. 2. Better Control: Under the command mode, the relay module can support up to 64pcs device in parallel, largely simplify your work. 3. Quick Response: Both the data sending and returning time can be set, with a maximum value of 1000ms, meeting your various needs. 4. Multiple Function: Comes with hardware reset function as well as TVS anti surge protection to ensure reliable working performance. 5. Easy to Install: Designed to have a compact size and a light weight, the easy installation can be quickly finished in minutes. Specification: Item Type: Relay Module Material: PCB Working Voltage: DC 12V Standby Current: 14MA 1 Relay Open: 40MA 2 Relays Open: 68MA 3 Relays Open: 96MA 4 Relays Open: 122MA 5 Relays Open: 149MA 6 Relays Open: 177MA; 7 Relays Open: 202MA 8 Relays Open: 226MA Default Baud Rate: 9600BPS Selective Baud Rate by Command: 2400BPS, 4800BPS, 9600BPS, 19200BPS, 38400BPS, 57600BPS, 115200BPS Maximum Data Sending and Returning Time: 1000ms Check Mode: No check, even check and odd check. Hardware Reset Function: Yes TVS Anti Surge Protection: Yes. Package List: 1 x Relay Module Note: Pay attention to the correct operation.