I've found it

old email from iriver
Quote:
...Thank you for your email.
The ability of anti-shock of iMP-550 is better than the one of iMP-900.
iMP-550: 80 sec or 320 sec (with worse sound quality)
iMP-900: 40 sec or 160 sec (with worse sound quality)
If you have further enquiries, please feel free to contact us again.
Regards
Leo
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... and many threads on MisticRiver ;]