brand new and high quality Features: Power and signal are fully isolated, with for stronger anti-interference ability and safer use. Adopts CH340E chip, no crystal oscillator, more stable performance. Industrial protection: TVS transient suppression for protection, electrostatic ESD for protection, surge for protection, AB signal line short-circuit and power short-circuit for protection (short-circuit does not burn). The transmission distance can reach 1200 meters (tested at 9600bps). Support baud rate 256000, higher baud rate is used for paired mutual transmission. Multi-system supports hot plug, support win98/CE/2000/2003/2008/XP/WIN7/WIN8/WIN10/VISTA/LINUX/OS X system, USB interface can be hot plug. Automatically distinguish and control the data transmission direction, without any handshake signals (such as RTS, DTR, etc.) without jumper settings to achieve mode conversion, to ensure compliance with the existing communication software and interface hardware. With power indicator, TXD, RXD indicator. Specifications: Power supply: USB 5V Transmission distance: up to 1200 meters (tested at 9600bps) Chip solution: CH340E Communication protocol: pure hardware equipment, not restricted by protocol Baud rate: up to 256000bps Material: ABS Size: app.70x27x13mm/2.76x1.06x0.51in Color: Blue Quantity: 1pc Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x USB to RS485 Communication Module(other accessories demo in the picture is not included.)