Dolphin M400 In Ground Robotic Pool Cleaner with Wi-Fi and Caddy
The Dolphin M400 In Ground Robotic Pool Cleaner with Wi-Fi and Caddy is built to deliver a deep clean. Extremely powerful when it comes to scrubbing and filtering, this Always Connected cleaner allows you to schedule weekly cleanings and spot clean from the palm of your hand using the MyDolphin Plus app.
Built by Maytronics with a 3-brush system, 4,500 gal/hr suction, full filter indicator, fine and ultra-fine cartridge filters, 60-foot tangle-free swivel cable, weekly timer, and a center scrubbing brush that pushes the limits for waterline cleaning — the M400 handles in-ground pools up to 50 feet with a 2.5-hour cycle. Caddy included. Backed by a 36-month warranty.
Key Features
MyDolphin Plus App (Wi-Fi)
Always Connected — schedule weekly cleanings and spot clean from anywhere using the app.
3-Brush System
3 brushes including a center scrubbing brush that pushes the limits for waterline cleaning.
4,500 Gal/Hr Suction Rate
Powerful suction for thorough debris collection on every pass.
Floor, Wall, and Waterline Coverage
Complete pool surface coverage in every 2.5-hour cycle.
Tangle-Free Swivel Cable
60-foot swivel allows the M400 to move effortlessly around the pool without tangling.
Full Filter Indicator
Alerts you when the cartridge filter needs to be emptied.
Fine and Ultra-Fine Cartridge Filters
Switch between fine and ultra-fine filtration based on debris type.
Weekly Timer
Set a weekly cleaning schedule for automated hands-free operation.
Caddy Included
Caddy for easy transport and poolside storage.
36-Month Warranty
Maytronics' best residential robotic warranty — 3 full years.
Who It's For
- In-ground pool owners with pools up to 50 feet who want app-connected scheduling and spot cleaning
- Anyone who wants maximum scrubbing power with a 3-brush system and 4,500 gal/hr suction
- Pool owners who want fine and ultra-fine filter options plus a full filter indicator
- Buyers who want the M400 performance with a caddy and 36-month warranty included
Specifications
Cleaning Performance
| Pool Size | Up to 50 ft |
| Cleaning Coverage | Floor, Wall, Waterline |
| Suction Rate | 4,500 gal/hr |
| Cleaning Cycle Duration | 2.5 hours |
| Climbs Walls | Yes |
| Brush System | 3 Brushes, 1 Active |
| Remote Control | No (app-controlled) |
Filtration
| Filter Type | Cartridge |
| Filter Porosity | Fine, Ultra-Fine |
| Filter Access | Top |
| Full Filter Indicator | Yes |
Cable & Controls
| Cable Length | 60 ft |
| Cable Type | Swivel (Tangle-Free) |
| App | MyDolphin Plus (Wi-Fi) |
| Timer | Weekly Timer |
| Motor Voltage | 24 VDC |
Physical
| Cleaner Weight | 26.967 lb |
| Shipping Weight | 53 lb |
| Shipping Dimensions | 23.4 × 19.5 × 19.11 in |
| Color | Gray, Blue |
| Caddy Included | Yes |
Approvals & Warranty
| Application | In-Ground Residential Pool |
| Cleaner Type | Residential, Robotic |
| Certifications | APSP Certified, CE Certified, ETL Certified, ROHS Certified |
| Warranty | 36 Months |
What's in the Box
- Dolphin M400 In Ground Robotic Pool Cleaner
- Power Supply Unit
- 60 ft Swivel Cable
- Cartridge Filter (Fine and Ultra-Fine)
- Caddy
- User Manual
Warranty
The Dolphin M400 In Ground Robotic Pool Cleaner with Wi-Fi and Caddy comes with a 36-month manufacturer warranty from Maytronics. Clearflow Pool Supply is an authorized Maytronics dealer and will assist with any warranty service needed.
Downloads
Frequently Asked Questions
What is the difference between the M400 In Ground and the M400 Without Caddy?
The M400 In Ground (99991046-USI) includes a caddy and is backed by a 36-month warranty. The M400 Without Caddy (99991053-USI) does not include a caddy and carries a 3-year warranty. Both are the same cleaner platform with Wi-Fi, 3-brush system, 4,500 gal/hr suction, and cartridge filtration.
What can I do with the MyDolphin Plus app?
The MyDolphin Plus app lets you schedule weekly cleaning cycles, trigger on-demand spot cleans, and monitor the cleaner's status — all from your smartphone via Wi-Fi from anywhere.
What does the full filter indicator do?
The full filter indicator alerts you when the cartridge filter has collected enough debris to need emptying — so you always know the cleaner is running at peak suction without manually checking after every cycle.
Does it require a booster pump?
No. The M400 plugs into a standard outlet and operates completely independently from your pool's pump and filtration system.
Does it clean the waterline?
Yes. The M400 cleans the floor, walls, and waterline in every cycle — with a center scrubbing brush specifically designed to push the limits for waterline cleaning performance.