1PCS R411A01 UART Serial To RS485 SP3485 Transceiver Converter Module(3.3V) Features: 3.3V Read/write automatic control RS485 TO RS232(3.3V TTL Logic level) converter Operating Voltage : DC 3.3V Logic level  : 3.3V LvTTL  Logic level  RS485 BUS IC : SP3485 Read and write automatic control IC :SM74HC04 7x 2.54MM pin (Does not include pin) ,mini size. Application:  RS485 Temperature and humidity sensor, PTZ camera,LED controller, RTU RS485 Relay,485 sensor,automated manufacturing line,Wifi to RS485(ESP8266),Bluetooth to RS485,Wireless Module to RS485(HC-11),Ethernet to RS485( Ethernet TTL Module)   5V Description:  Read and write automatic control RS485 TO RS232(5V TTL Logic level) converter Operating Voltage : DC 5V Logic level  : 5V TTL  Logic level  RS485 BUS IC : SP485 Read and write automatic control IC :SM74HC04 7x 2.54MM pin(no pin),mini size. Application :  RS485 Temperature and humidity sensor,PTZ camera controller,LED controller, RTU RS485 Relay,485 sensor,automated manufacturing line,Smart home Specification: Type: 3.5V, 5V(Optional) Size :17.8*11.6*2.8mm/0.7*0.5*0.1in Weight: Approx.2g/0.1oz Package list: 1 x Transceiver Converter Module