Features: Single-chip 340 crystal 12M USB port to serial port communication, easy to use. USB 1.1/2.0 compatible solution with built-in 128 byte TX / 512 byte RX cache for automatic handshake protocol. Fit for Win95/98/98se/ME/2000/XP/win7 32bit 64bit /Vsita, support full speed transmission. With USB data transfer protocol, data transfer is more convenient. Anti-electromagnetic interference design, use more assured. This product can make USB and serial devices easy to connect, so that serial devices have plug-and-play, hot swap and other functions. Can meet the notebook connection various serial devices, suitable for communication with mini phone, digital camera, MODEM, ISDN terminal adapter, LED control card, does not support 51 single-chip (STC11, 12C series industrial equipment serial port does not support) ARM, ARM9 . Specifications: Condition: 100% Brand New Material: metal, plastic Package list: 2 * USB To RS232 Serial Port 1Single-chip 340 crystal 12M USB port to serial port communication, easy to use 2USB 1.1/2.0 compatible solution with built-in 128 byte TX / 512 byte RX cache for automatic handshake protocol 3Fit for Win95/98/98se/ME/2000/XP/win7 32bit 64bit /Vsita, support full speed transmission 4With USB data transfer protocol, data transfer is more convenient 5Anti-electromagnetic interference design, use more assured