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Longest battery endurance in the cordless Dolphin lineup for thorough 50-ft coverage.
Dedicated Charging Dock
The 'D' badge adds dock charging so you aren't plugging cables in after every swim.
Stairs, Ledges & Corners
Advanced sensor suite cleans wide entry steps, ledges, and tight corners.
Multi-Layer Cartridge
Separates coarse leaves and fine silt in one top-access chamber.
Full Waterline Scrubbing
Dual active brushes scrub floor, walls, and tile scum lines.
myDolphin™ Plus App
Customize zone focus, Eco schedules, and retrieval settings.
Our Take
Who the Dolphin Nautilus EON 120D Is Really For
Best For
The longest runtime of any cordless Dolphin
The Bottom Line
Maytronics' longest-running cordless cleaner (up to 4.5 hours) with charging dock convenience—built for large 50-ft pools with stairs and ledges.
The EON 120D is the EON 100 with the two things that model most needed: a much bigger battery and finer filtration. 4.5 hours of runtime removes the main practical limit on cordless Dolphin cleaning.
Runtime changes what's possible
At 2.5 hours a cordless robot is racing the clock on a 50 ft pool. At 4.5 hours it can do a genuine full pass with margin, or run an eco cycle for most of a day. That's the difference between a machine you plan around and one you don't think about.
Five modes
Floor-only, waterline-only, regular, smart run and eco. Waterline-only is the underrated one: when the floor is fine and only the tile band has gone grey, you can send it straight at that and use a fraction of the battery.
Filtration
Multi-layer cartridge filtration captures the ultra-fine particles that cloud water alongside the larger debris — a step up from the plain basket on the EON 100.
Worth knowing before you buy
Review volume remains low and the average middling. The Dolphin Liberty 300 and 400 in our range are the cordless Dolphins we'd recommend first, with our own support behind them.
Specifications come from the manufacturer or Amazon listing.
Side-by-side comparison
How the Dolphin Nautilus EON 120D Stacks Up
This model next to the three ProLine™, Max-Series™ and Clear™ robots closest to its price. Use the dropdowns to put any robot in a column: every Dolphin line, the Clear™ Series, and the other brands we carry.
