Feature:1. 4 CHANNEL RELAY: Multifunctional RS485 relay module, 4 channel design, which has excellent performance, stable connection and less interference.2. COMMAND SETTING: The input and output can be set to various association modes by commands, and the baud rate also can be selected by commands.3. DEVICE PARALLEL: In command mode, up to 64 devices can be connected in parallel, and you can press Enter through the serial hyperterminal (serial port assistant).4. MULTIPLE FUNCTION: The relay module has no parity, even parity and odd parity multiple methods, hardware reset function and TVS anti surge protection.5. WIDE APPLICATION: The 4 channel relay module has a compact structure and is widely used in industrial automation and electrical equipment control, etc.Specification:Item Type: 4 Channel Relay ModuleWorking Voltage: DC 12VStandby Current: 11MA1 Relay Open: 30MA2 Relays Open: 49MA3 Relays Open: 65MA4 Relays Open: 82MADefault Baud Rate: 9600BPSSelectable Baud Rate by Command: 2400, 4800, 9600, 19200, 38400, 57600, 115200BPSMaximum Data Sending and Returning Time: 1000msParity Mode: No parity, even parity and odd parityHardware Reset Function: YesTVS Anti Surge Protection: Yes.Package List:1 x Relay ModuleNote:Pay attention to the correct operation.