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The MB4040’s nine comb settings are not a one-millimetre scale. Remington lists 1.5, 2.5, 4, 5.5, 7, 9, 11, 14 and 18 mm. The same guide explicitly says plugging in the adaptor recharges the battery rather than powering the trimmer for use.
Read the setting table before choosing a length
A wearer choosing 4 mm has a listed position. A wearer seeking 3 mm does not find it in this table. The broad 1.5-18 mm range should therefore not be promoted as offering every intermediate beard length.
The adjustable comb must be attached for the zoom wheel to control cutting length. Removing it for edges changes the cutting configuration. A number on the wheel is not a promise that the exposed blade retains that length.
The shared manual distinguishes MB4040 from MB4020
Remington identifies a stubble blade as MB4040-only and gives different charging figures for the two models. Do not treat every diagram or specification in the shared booklet as applying identically. Check that a used MB4040 includes the heads relevant to your planned routine.
- Confirm the actual nine settings against your preferred beard length.
- Inspect the adjustable comb and quick-release cutter.
- Assess the battery’s usable condition because the cord is not a bypass for a failed battery.
Can it keep running while the adaptor charges it?
The documented model cannot be treated as a corded trimmer. If uninterrupted mains use is essential, compare a tool expressly supporting that operation.
Source: Remington MB4020/4040 instructions. Our guard guide explains selectable positions. No site-measured runtime or cutting result is claimed.
