No need external power Supports Industrial PC Four layer PCB design Provides four -232 male DB9 ports for direct connection to serial devices. Colour: Black material: plastic Support USB 2.0 HI-Speed. Supports serial devices modems, PDAs, cellular phones, digital cameras, card , and more. Easy Plug and Play Installation. Compliance with 16C950, and is backward compatible Transceiver 128- Data transfer rate of up to 921.6KB / s Serial port number adjustable LED Status: On Power On Off Power Off system support: /8.X/7/Vista/xp 32/64-bit, Linux 2.6.x/3.x/4.x/ os X10.5 to 10.10 system Size:(L*W*H)10.20*9.50*2.60cm/4.02 inch*3.74 inch*1.02 inch cable length:150cm/59.06 inch :1Set Package Contents: 1Pc x Serial Adapter 1Pc x USB cable Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.