Model differences

Cumrige M2 vs M4 vs M5 vs E vs M6: cat fit and litter limits

Begin with entry form, not the capacity headline

The M2 and M4 are enclosed, front-entry rotating drums. M2’s round entry is listed at 9.84 inches and its body at about 19.69 × 21.65 × 25.98 inches. The M4 also has a 9.84-inch entrance; the maker lists about 19.29 × 21.65 × 25.59 inches. Its FAQ is unusually cautious about the enclosed interior, suggesting cats around 11 pounds or under even though the machine has a higher equipment load limit. A cat must be willing to enter, turn and posture in the chamber, so an equipment limit is not the same as a fit recommendation.

The M5 and E are open-top rotating sifters. Their exposed entry gives a cat a different route and lets the owner see the litter bed, but it may also permit more scatter. M5 is about 21.65 × 20.47 × 21.1 inches; E about 21.8 × 20.4 × 21.1 inches. M5 has a 10.5-liter drawer and a maker claim of two to three cats. E’s listed bin is 15 liters, but its U.S. product page does not give a numeric household cat count. Do not convert volume into a capacity rating.

The gray M6 listing is an enclosed drum with a 10-liter bin and app controls, but its identity material conflicts: the product details call the model M6, parts of the page title say “S,” the option SKU is 4073D, and the linked quick guide filename says 4076A. The page reports dimensions but does not specify their axes. The guide recommends a cat at least 15 cm tall at the shoulder. Weight, age and numeric cat capacity remain unknown; a “Kitten Mode” name does not fill in those missing thresholds.

Published fit thresholds do not match across the range

The M2 manual names a minimum cat weight of 2.2 pounds and minimum age of three months; the manufacturer FAQ recommends it for cats up to about 16.5 pounds. The M4 FAQ gives an approximate three-cat capacity and its own smaller-cat fit advice, but the reviewed source set does not resolve a minimum age or minimum cat weight. M5’s page gives a broad 2.6–33 pound claim, while its manual is more conservative: 3.3-pound minimum, 27.5-pound upper guide, and no automatic use below six months. E’s page lists a 3.3–27.5 pound range; its Mini-E manual adds the six-month age direction, but the page supplies no numeric cat-count rating. Use the narrower exact manual direction where page copy differs, and do not assume a cat is comfortable solely because its weight falls inside a published range.

Litter is a genuine operating constraint

All five are based on clumping-litter separation, but Cumrige’s current model pages do not support treating every formulation as interchangeable. The M2 FAQ recommends firm, low-dust clumping litter and rejects non-clumping crystal. M4 particularly recommends clumping bentonite and a longer delay so clumps can form. M5 and E list bentonite, mineral and mixed litter, while excluding tofu and crystal. M6 says “most clumping” without a precise accepted-particle list. If tofu, crystal, a specific plant litter or a mixture is non-negotiable, require exact confirmation for the exact model rather than generalizing from another Cumrige box.

Controls, network and maintenance

M2 and M4 pair with Tuya over 2.4 GHz, but the maker says their core operation and local controls can work without Wi-Fi. M2 uses an illuminated touch panel; M4 has three physical buttons. M5 supports app status and controls over 2.4 GHz; E lists 2.4 GHz app and button control. M6 uses a Smart Life app and its guide also shows button control. App logs can be handy, but they are not a medical interpretation and are not proof of accurate individual-cat identification. On M6, check the exact SKU/manual correspondence before relying on a mode or model-specific specification.

The M2, M4 and E pages list 15-liter waste bins; M5 lists 10.5 liters and M6 10 liters. A volume is not an emptying schedule. The M2’s approximate two-week estimate is for a single cat around 8.8 pounds; the M4 page provides an illustrative one-, two- and three-cat interval that becomes progressively shorter. Inspect the drawer routinely and establish a home schedule. All require power, setup, litter top-ups and cleaning of designated removable components; keep liquid away from the electronic base and follow the exact instructions. A sealed bin can contain waste but cannot promise no odor or litter tracking.

A practical shortlist

• Choose M2 if an enclosed entry, optional app and the manual’s low minimum weight/age thresholds are helpful; inspect the entrance and the 16.5-pound conservative upper guide.
• Choose M4 if you want an enclosed drum, local physical buttons and the maker’s three-cat statement, and your cats fit its more cautious turning-room advice.
• Compare M5 if open-top entry and a maker-stated two-to-three-cat range matter; keep its six-month/3.3-pound manual limits and litter exclusions in view.
• Compare E if open top and a 15-liter drawer suit your routine, but do not treat its larger bin or broad “multi-cat” language as a rated household count.
• Consider M6 only if the shoulder-height guide applies and unknown weight, age and cat-count limits are acceptable. Confirm whether the delivered label is 4073D/M6 and which instructions govern it.

Read the individual M2, M4, M5, E and M6/4073D assessments. Official pages: M2, M4, M5, E and M6 product listing. These are manufacturer specifications and instructions, not independent performance tests.