I bought the 4L model and it just isn't big enough. This 6L is spot on. Works quietly even when not in sleep mode. Sleep mode reduces fan speed and dims the LED, but I don't really think it's necessary since it's already very quiet. (At least for me.) I recently got the 4L and am looking forward to having it in my office. GREAT little unit. Suggestion to AstroAI: Make the inside of the mold three tiers for the shelf. Thus, it can be set in the refrigerator. I recommend this device!
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