Curtis SMPK4068 - Manual (Page 39)

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USB Port USB2.0
Operational Temperature 0℃ ~ +55℃
Storage Temperature -20℃ ~ +55℃
Operational Relative
Humidity * 20% ~ 90% (40℃)
Storage Relative Humidity * 20% ~ 93% (40℃)
18. Notice
z Make sure all keys are enabled before operation. If they are locked, hold down the
MENU and VOL- button to unlock them.
z Please charge the battery immediately when the display indicates low battery, or
the device will be powered off automatically.
z The device does not guarantee compatibility with all memory cards from various