It comes with a tether that lets unfortunately poor (screw fastening), the coup plan rather other fastening system to your keyring.
Approximate Size: 2 cm long, 1 cm wide, 0.4 cm in height.
28.8 GB of available space when connecting to a Windows 7 immediately recognized plug and play!
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EDIT 09/25/2014: the clip was provided unscrewed suddenly I lost my USB stick. She is so small that I could not find her.
If you buy it, take care to tighten the screw regularly and not to put too much sensitive data on it as risk of loss ...