Dolphin M400 Robotic Pool Cleaner
Available from authorized dealers
Dolphin M400 robotic pool cleaner for pools up to 50 ft. Compare floor, wall and waterline cleaning, filtration, warranty and availability.
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Cleans Floor, Walls and Waterline -
Pools up to 50 ft -
3-Year Maytronics Warranty -
Local Pricing & Availability
Need help? Speak to a Dolphin Pool Cleaner Specialist ProLine™
Frequently bought instead.
The M400 is sold through authorized dealers. These in-stock Max-Series™ and ProLine™ alternatives can be purchased directly, with free shipping, a 30-day in-pool trial and no restocking fee.
Dolphin Quantum
XXL MaxBin™, NanoFilters™ and app control.
Why Dolphin M400?
Floor, Wall and Waterline Cleaning
Dolphin M400 cleans the floor, walls and waterline in pools up to 50 ft, reducing the areas left for manual brushing.
Easy Top-Load Filtration
The top-load Fine Filter Kit traps debris as the robot moves through the pool, and the included Ultra-Fine Filter Kit adds a second filtration option.
App-Connected Control
Use MyDolphin™ Plus for compatible controls and scheduling from your phone.
Compare
Which Dolphin is right for you?
Put any two Dolphin robots next to the M400. Pick a model in each column.
Dolphin M400 This robot
Floor, Walls and Waterline cleaning for pools up to 50 ft with Fine Filter Kit.
$ on Amazon
M‑SERIES POOL CLEANER
M400 Features and Performance.
Dolphin M400 cleans the floor, walls and waterline in pools up to 50 ft in a 2.5-hour cleaning cycle. The M400 combines multiple scrubbing brushes, a Fine Filter Kit and guided navigation to move through the pool and collect debris. A corded power supply delivers continuous power throughout the cleaning cycle.
What's Included
Package contents can vary by dealer. Confirm the included filters, caddy and accessories before purchasing.
Dolphin M400 robotic pool cleaner
Fine Filter Kit and Ultra-Fine Filter Kit
Power supply and cable
User manual and warranty documents
POOL COVERAGE
Complete Floor-to-Waterline Coverage
Dolphin M400 cleans the floor, walls and waterline in pools up to 50 ft. Guided navigation helps it follow a consistent path in rectangular, round, freeform and kidney pools.
FILTRATION
Easy Top-Load Filtration
The top-load Fine Filter Kit captures debris during each pass. An Ultra-Fine Filter Kit is also included for finer debris.
CONTROLS
Control Cleaning from Your Phone
Dolphin M400 plugs into its power supply and runs a 2.5-hour cleaning cycle. Set the weekly timer for recurring cleanings. Use MyDolphin™ Plus for compatible phone controls.
OWNERSHIP
Warranty and Everyday Care
M400 weighs about 27 lb. Rinse the filter and robot after each cycle, then store them as directed in the manual. A 3-year Maytronics manufacturer warranty is included. Ask an authorized Dolphin dealer about current pricing, inventory and included accessories.
Complete your setup
Optional Accessories
Add a caddy and a caddy cover for your Dolphin M400 to make transporting, storing and protecting it even easier.
Dolphin Universal Caddy
$145
The Dolphin Universal Caddy makes storing and moving your Dolphin Cayman effortless. Roll your robot and power supply poolside with this heavy-duty caddy.
Dolphin Premium Caddy Cover
$99
Protect your Dolphin Cayman and caddy from sun, rain, and debris with the Dolphin Premium Caddy Cover. A durable, weather-resistant fit.
Where to Buy
Find current pricing and availability for Dolphin M400 Robotic Pool Cleaner through an authorized Dolphin dealer.
Authorized dealer
Dolphin M400 Robotic Pool Cleaner
Dolphin M400 robotic pool cleaner for pools up to 50 ft. Compare floor, wall and waterline cleaning, filtration, warranty and availability.
Find your perfect pool robot
Explore More Dolphin Robots
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Dolphin Premier
Commercial power with Multi-Media filtration, NanoFilters, and a Weekly Timer.
Dolphin Sigma
Three commercial motors, quad brushes, and gyroscopic navigation.
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Dolphin Cayman
Premium features and unbeatable value with MaxBin™ and HyperBrush™.
