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 ModuleMaterial: PCBWorking Voltage: DC 12VStandby Current: 14MA1 Relay Open: 40MA2 Relays Open: 68MA3 Relays Open: 96MA4 Relays Open: 122MA5 Relays Open: 149MA6 Relays Open: 177MA;7 Relays Open: 202MA8 Relays Open: 226MADefault Baud Rate: 9600BPSSelective Baud Rate by Command: 2400BPS, 4800BPS, 9600BPS, 19200BPS, 38400BPS, 57600BPS, 115200BPSMaximum Data Sending and Returning Time: 1000msCheck Mode: No check, even check and odd check. Hardware Reset Function: YesTVS Anti Surge Protection: Yes.Package List:1 x Relay ModuleNote:Pay attention to the correct operation.