1、64 Devices in Parallel: The relay module has 12 optically isolated inputs and 12 relay outputs for greater durability. Support up to 64 devices in parallel in commands mode. 2、Default Baud Rate: The default baud rate of the relay module is 9600 BPS. baud rate can be selected by commands to be 2400, 4800, 9600, 19200, 38400, 57600, 115200 BPS. 3、Surge Protection Function: This relay module has hardware reset function with TVS surge protection to make the use process safer. 4、Data Sending Time: The parity of the relay module can be no parity, even parity and odd parity. The time to send and return data can be set, the maximum value is 1000ms. 5、Standard Commands: Our relay module supports standard commands, function coding, write 05, 06, 15, 16 read 01, 02, 03. Item Type: Relay Module Material: PCB PCB Board Size: Approx. 190 x 72mm/7.5 x 2.8in(L x W) Standby Current: All relays off 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 201MA, 8 relays open 225MA. 1 x Relay Module