This is a DEDHQ-D4LL1W 2.4 Gallon Shelf, Direct drive eliminates motor belts & pulleys. Efficient quality design, only five moving parts per shelf. Extremely quiet. Approximately 68 decibels. Side panels features two powder coated steel side panels per shelf. Modular & versatile, easily upgradeable by simply adding or removing shelves at any time. Easy to maintain, maximum safety.