OT-H13:
1) 4 ports USB hub with aluminum cover
2) Full support of USB 2.0 data transfer speed up to 480Mbps each port
3) Truly plug-and-play and hot-swappable functions
4) Supports Win 95 OSR2 / 98 / 98SE / ME / 2000 / XP, Linux / Mac OS
5) USB bus powered, no external power adapter
6) Dimensions: 83 x 33 x 13mm

OT-H15:
1) 4 ports flat metal USB hub
2) USB2.0 or USB1.0 / 1.1interface; compact and super slim aluminum housing
3) One upstream (USB B mini type); IBM PC and Macintosh compatible
4) No driver needed; supports Windows 98SE / ME / 2000 / XP or Mac OS8.6 later
version
5) External power adapter: DC 5V, 2A (optional)
6) Dimensions: 60 x 15 x 13mm
7) Weight: 25g

OT-H16:
1) 4 ports mini metal USB hub with aluminum cover
2) USB2.0 compliant
3) USB bus powered, no external power adapter
4) Supports Win 95 OSR2 / 98 / 98SE/ ME / 2000 / XP, Linux / Mac OS
5) Dimensions: 58 x 30 x 11mm
6) Color: black, golden, blue, argent