How much does this cost to the nearest dollar?

DTech Active Isolated RS232 to RS485 RS422 Converter with RJ45 Serial Port Terminal Board Power Adapter DB9 Cable Optical Isolation Protection 2.5kV
Bidirectional opto-isolated RS232 to RS485 converter allows to interface your devices using RS232 communication link to balanced differential link and vice-versa. Surge Protected Interfaces Protect Equipment, High Speed Data and the Converter Powered RS485 isolator provides optical isolation up to 500DC continuity; transient voltage suppressor TVS supports 600W lightning surge protection over each line of link; 15KV static protection over RS232 link effectively protects your value devices against high voltage spikes. With built-in booster to amplify signals, it’s a quick simple solution for most industrial automation, commercial computer network application, motor control, even

Price is $42.00

Price: $41.88