Product Name:3V3 5V DC Read And Write Automatic Control Converter Auto Switching Product Description:5V RS485 to TTL232 :Read and write automatic control RS485 TO RS232(5V TTL Logic level) converterOperating Voltage : DC 5VLogic level : 5V TTLRS485 BUS IC : SP4857x 2.54MM pin,mini size.Size : 17.9x11.7x2.8mm(Does not include pin)Weight :1.2g(with PIN);0.7g(no PIN)3.3V RS485 to TTL232 :Read and write automatic control RS485 TO RS232(3.3V TTL Logic level) converterOperating Voltage : DC 3.3VLogic level : 3.3V TTLRS485 BUS IC : SP34857x 2.54MM pin,mini size.Size : 17.9x11.7x2.8mm(Does not include pin)Weight :1.2g(with PIN);0.7g(no PIN)