Our take
Nostalgia RMO400BLK is a black 0.9-cu.-ft., 800-W countertop microwave with a retro dial and twelve menus; its series manual lists 1,280-W input at 120 V/60 Hz, while tray, sensor, trim and current-offer details remain unknown.
Consider RMO400BLK if you want a black retro-style countertop microwave with a documented 0.9-cu.-ft. cavity, 800-W output and dial-plus-one-touch controls. The RMO400 Series manual lists 1,280-W input at 120 V/60 Hz; check the appliance label and circuit instructions for the exact unit. Confirm the full model code and turntable fit, and do not use the conflicting BUNN metadata or old ASIN as proof of a present listing..
If you need a known tray size, suffix-specific electrical confirmation, sensor functions, trim fit or foodservice classification, compare an exact-model source that states those fields. Verify the RMO400BLK nameplate before relying on the series supply rating.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The exact product record identifies a black Nostalgia countertop microwave with 0.9 cu. ft. and 800-W output.
- Its turn/push dial, LED clock and twelve one-touch menus are concrete control differences.
- The official RMO400 Series manual separates 1,280-W input from 800-W output at 120 V/60 Hz.
What to weigh up
- The source row's BUNN metadata conflicts with the exact Nostalgia model record.
- The manufacturer manual covers the RMO400 series but does not state the BLK suffix separately.
- Tray diameter, sensor status, trim fit and current exact offer remain unknown.
The key details
| Model covered | RMO400BLK |
|---|---|
| Capacity | Nostalgia RMO400BLK; black countertop product record |
| Microwave output | 0.9-cu.-ft. capacity and 800-W cooking output; RMO400 Series manual lists 1,280-W input |
| Cooking approach | Manufacturer series manual specifies 120 V / 60 Hz; exact finish remains from the retailer record |
| Installation options | LED clock display, twelve one-touch menus and turn/push dial |
| Finish and turntable | Numeric turntable diameter, sensor status and trim pairing not established; current ASIN offer unverified |
Performance figures are manufacturer claims. Source checked October 11, 2026. Regional models and included accessories can differ.
What the features mean for you
Use the exact RMO400BLK identity
Office Depot lists model RMO400BLK and UPC 082677140005 under Nostalgia, while the frozen row says BUNN. The exact model record and Nostalgia manual publisher support Nostalgia as the brand identity; the conflicting BUNN field is not carried into the product. The old ASIN still has no verified current offer mapping.
Match a 0.9-cu.-ft. cavity to intended dishes
The exact listing gives a 0.9-cu.-ft. capacity. That establishes its interior volume but not a numeric turntable diameter, so it cannot answer whether every wide plate will rotate without contact. Check the actual tray and cavity opening against your usual cookware before choosing by volume alone.
Use the documented output and input separately
Office Depot lists 800 W of microwave power, and the official RMO400 Series manual separately lists 1,280 W input at 120 V/60 Hz. The manual's series-level scope does not name the BLK suffix, so confirm the exact rating plate. Compare output with other cooking-power figures and use input and supply for electrical planning.
Understand the dial and one-touch menu layout
The listing describes a turn/push control dial, LED clock display and twelve one-touch menu options. These controls distinguish the model from numeric-keypad designs, but the listing does not say those menus use moisture sensing. Sensor cooking therefore remains unknown, rather than being inferred from automatic selections.
Keep freestanding use separate from trim installation
The exact-model record identifies RMO400BLK as a countertop microwave. No exact optional trim-kit pairing is given. Use it as a countertop product according to the manual clearances; the retro exterior and cabinet dimensions do not demonstrate built-in compatibility. Measure the counter area and follow the clearance distances in the series manual rather than placing the case in a snug opening. Retailer cabinet measurements do not certify built-in installation or trim-kit approval.
Verify appearance and operating class on the unit
The exact model listing identifies a black finish, but the failed historical Amazon page does not verify a current offer or condition. The reviewed sources also leave tray size and commercial-duty status unassigned. Confirm the full label and supplied manual for those attributes, and treat the series electrical rating as family guidance until the unit plate is checked.
What else to compare
Before you buy
What are the listed capacity and output?
The exact RMO400BLK record gives 0.9 cu. ft. and 800 W.
What controls does it use?
The listing describes a turn/push dial, LED clock and twelve one-touch menus.
Is it countertop or built in?
The exact-model listing identifies a countertop microwave; no trim pairing was established.
Is the old BUNN brand field reliable?
No. The exact model record and Nostalgia documentation support Nostalgia as the brand identity.
What input and supply does the RMO400 Series manual list?
The series guide lists 1,280-W input at 120 V/60 Hz; verify the BLK unit's nameplate.
Does it have sensor cooking?
The exact listing names menus but does not establish sensor cooking.
What is its turntable diameter?
A numeric tray diameter was not established in the reviewed exact-model record.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Exact-model Office Depot product record; Nostalgia RMO400 Series manual for family electrical specifications ↗ — checked October 11, 2026.
- Exact-model record identifies Nostalgia RMO400BLK as black and countertop, lists 0.9 cu. ft., 800 W, twelve menus, LED clock, turn/push dial and UPC 082677140005. ↗ — checked October 5, 2026.
- Official Nostalgia RMO400 Series manual rechecked: 120 V/60 Hz, 1,280-W input, 800-W output and 0.9 cu. ft.; series manual does not separately name the BLK suffix. ↗ — checked October 11, 2026.
- Nostalgia-hosted related family manual establishes maker identity; not used to transfer other specifications to RMO400BLK. ↗ — checked October 5, 2026.
- Historical Amazon page returned an internal error; conflicting BUNN field and current exact offer remain unverified. ↗Paid link · We may earn a commission. — checked October 5, 2026.
The decision
Nostalgia RMO400BLK is a black 0.9-cu.-ft., 800-W countertop microwave with a retro dial and twelve menus; its series manual lists 1,280-W input at 120 V/60 Hz, while tray, sensor, trim and current-offer details remain unknown.
Is it the right fit?
Check the exact model and today’s offers on Amazon.