Features: brand new and high quality Support 5V or 3.3V power supply, choose one of them; Serial level, pin suitable for 3.3V and 5V. The baud rate of serial port supports 300-921600bps, The serial port supports full-duplex and half-duplex serial communication, and supports RS485 transceiver automatic switching. Bidirectional transmission of serial port data and networking data; Support MDIX automatic conversion, direct networking cable arbitrary connection, modules automatic switching. Support virtual serial port software, and virtualize the networking port into a computer COM-port. Support 10/100M, full-duplex/half-duplex adaptive Ethernet interface, suitable for 802.3 protocol. Specifications: Material:ABS Interface standard: RJ45 interface Ethernet: 10/100Mbps Protection: 2KV electromagnetic isolation Interface standard: serial port, 2.54MM pin, 3.3V or 5V level Baud rate: 300-921600bps Data bits: 5,6,7,8,9 Stop bit: 1,2 bit Parity: no parity, odd parity, even parity Flow Control: None Operating current 200mA@5V Power consumption 1W Operating temperature -40-85C Storage temperature -55-125C Size: Approx.43x23x14.5mm/1.7x0.9x0.57inches Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set CH9121 Networking Modules