No need external power Supports Industrial PC Four layer PCB design Provides four RS-232 male DB9 ports for direct connection to serial devices. Support USB 2.0 HI-Speed. Supports various serial devices modems, PDAs, cellular phones, digital cameras, card readers, and more. Easy Plug and Play Installation. Compliance with 16C950, and is backward compatible Transceiver 128-Byte FIFO Data transfer rate of up to 921.6KB / s Serial port number adjustable LED Status:On Power On, Off Power Off system support: windows 10/8.X/7/Vista/xp 32/64-bit, Linux kernel 2.6.x/3.x/4.x/mac os X10.5 to 10.10 system colour: black Material: ABS Size: 10.2x9.5x2.6cm Package Contents: 1 x USB Serial Controller Card Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.