Features 【TVS Anti Surge Protection】: This relay module board has the ability of TVS anti surge protection to defend the safety in the process of use. 【Data Transmission】: The maximum data transmission and return time of this relay module board is 1000ms, and the default baud rate is 9600BPS, you can choose according to the actual use. 【Hardware Reset】: This relay module board has hardware reset function, and there are three kinds of regular checksum methods, no checksum, even checksum and odd checksum. 【Associated Mode Setting Method】: The relay module board can be set to various association modes by means of input output relationship through the serial super terminal serial assistant carriage return. 【Parallel Connection of Multiple Devices】: This relay module board can support up to 64 devices in parallel in instruction mode, with strong parallel processing function. Specification: Item Type: Relay Module Board Material: PCB Operating Voltage: DC 24V 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 Selectable Baud Rate: 2400, 4800, 9600, 19200, 38400, 57600, 115200BPS Data Transmission and Return Time Maximum: 1000ms Calibration Mode: No parity, even parity and odd parity Hardware Reset Function: Yes TVS Anti Surge Protection: Yes Package List: 1 x Relay Module Board Note: Pay attention to the specification of the correct operation Package List 1 x Relay Module Board