Features: This is RS232 to TTL isolated converters with SP3232 inside. With LED indicator lights used to indicate the power status and signal transmission status of the circuit; With independent power isolation,TTL side RXD, TXD, RTS pin have overcurrent protect and strong shock resistance. RS232 side RXD, TXD, RTS pin are equipped with overcurrent protect and electrostatic protect circuits. The electrostatic protect circuit will release static electricity to the outer metal part of the RS232plug. For better protect, it is recommended to ground it; Specifications: Material:Metal Size:Approx.70.5x45x24mm/2.78x1.77x0.94inch RS232 To TTL Industrial Isolated Converters Package Includes: 1pc RS232 To TTL Adapter note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.