20. If you have forgotten to attach the metal frame before you closed the cover, simply press downthe rib and the cover will slowly release and open outwards. Please do not attempt to pull thecover with something sharp.21. If the fan stops working, do not dismantle it. Please send back to the retail store immediately.22. Temperature -20 ~ 60 °CHumidity 90 % RH23. Smart fan controlled by the built-in thermal sensor and it comes with 2 modes (auto / manual)and 3 levels of speed:Level 1 : below 45 °C 1200-1800rpmLevel 2: 45 °C ~ 54 °C 1800-2500rpmLevel 3: hotter than 55 °C 2500-3500rpm24. Operation System:Windows 2000 / XP / Vista/7 32/64bit ( with MBR enabled, supports total capacity up to 2TB )Vista/7 32/64bit ( with GPT enabled, supports total capacity more than 2TB )Macintosh 10.3.x or later25. Support USB transfer speeds of Low speed (1.5Mbps), Full speed (12Mbps),High Speed (480Mbps), Super Speed (5Gbps), eSATA transfer speed (1.5~3.0Gbps)EN - 37/38