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IMPORTANT SAFETY 

INSTRUCTIONS 

When using electrical appliances, 

especially when children are pres-

ent, basic safety precautions should 

always be followed, including the  

following:

READ ALL 

INSTRUCTIONS 

BEFORE USING.

DANGER

As with most electrical appliances, 

electrical parts are electrically live 

even when switch is off. To reduce 

the risk of death by electric shock:

■ 

Do not reach for a trimmer that 

has fallen into water. Unplug 

immediately.

 Do not use while bathing or in a 

shower.

 Do not place or store trimmer 

where it can fall or be pulled into a 

tub or sink. Do not place in or drop 

into water or other liquid.

 Except when charging, always 

unplug this trimmer from the 

electrical outlet immediately after 

using.

■ 

Unplug this trimmer before 

cleaning.

 Do not use outdoors or  

operate where aerosol (spray)  

products are being used or where 

oxygen is being administered.

 Do not use this trimmer with a  

damaged or broken cutting unit,  

as facial injury may occur.

 Always attach plug to trimmer, 

then adapter to outlet. To 

disconnect, turn all controls to OFF, 

then remove adapter from outlet, 

then detach power cord from the 

trimmer for storage.

 Always store your trimmer 

and adapter in a moisture-free 

area. Make sure the cord is 

disconnected from the trimmer. 

 Keep trimmer out of extreme heat 

and cold. Product must be stored 

at 0º F to 120º F.

 Dispose of used batteries properly. 

Do not incinerate. Batteries may 

explode if overheated. Do not wrap 

in metal or aluminum foil. Wrap in 

newspaper before discarding. It is 

suggested that you contact local 

town/city officials to determine 

proper battery redemption site(s)  

in your area.

 For household use only.

WARNING

To reduce the risk of burns, fire,  

electric shock or injury to persons:

■ 

Do not crush, disassemble, expose 

to excessive heat or incinerate the 

appliance.

 Your trimmer should never be 

left unattended when plugged 

in, except when charging your 

rechargeable trimmer.

 Close supervision is necessary 

when this trimmer is used by, on, 

or near children or persons with 

certain disabilities.

 Use this trimmer only for its 

 intended use as described  

in this manual. Do not use  

attachments not recommended  

by the manufacturer.

 Keep the cord away from heated 

surfaces.

 Never operate this trimmer if it has 

a damaged cord or if it is not  

working properly, if it has been 

dropped or damaged, or dropped 

into water. Return the trimmer  

to a service center for examination 

and repair.

 Never drop or insert any object into 

any opening.

SAvE ThESE INSTRUCTIONS

KEEP AWAY FROM ChILDREN

Product Features

Before Using

Quick Release Blades

Feature Checklist

1.

 On/Off Switch

2. Zoom Wheel
3. Adjustable Comb
4. Power Port
5. Quick Release Button
6. Length Indicator
7. Charging Indicator
8. Goatee Blade
9. Stubble Blade (MB4040 only)
10. Beard Blade

Charging/Recharging

To recharge this trimmer, use only 

the charging adapter provided.

■ 

Turn the trimmer off. Insert the 

adapter plug into the Power Port, 

then plug the adapter into an 

electric wall outlet. The Charging 

Indicator will illuminate, indicating 

unit is charging. A full charge will 

take approx. 3 – 5

 

hours for the 

MB4040. A full charge will take 

approximately 20 hours for the 

MB4020.

 Your trimmer cannot be 

overcharged. You may leave it 

plugged in between uses. However, 

if the trimmer is not going to 

be used for an extended period 

(2 weeks), unplug the unit and 

recharge when resuming use.

 Charge the trimmer at 

temperatures between 40 – 90°F, 

to avoid adversely affecting battery 

life.

 In order to preserve the life of 

the batteries, they should be fully 

discharged every six months and 

then fully charged for 24 hours.

 Li-Ion

 

batteries included on the 

MB4040. Nickel-Metal Hydrid

 

batteries included on the MB4020. 

(see battery removal section for 

proper disposal of batteries).

■ 

In cordless mode, your MB4040 

trimmer will run for 120+ minutes 

before additional charging is 

required. The MB4020 will run for 

approximately 40 minutes before 

additional charging is required.

Before Using Your Trimmer

■ 

Before using your trimmer for the 

first time, charge the unit 24 hours 

for optimal performance.

■ 

Make sure your face and facial hair 

are clean and dry.

 Double check that the Adjustable 

Comb is the desired position. 

Cutting length is visible in Length 

Indicator.

Quick Release Blades

■ 

The blade assembly can be 

removed to change blades or for 

easy cleaning.

 To remove blade assembly, press 

the Quick Release Button and pull 

blade away from trimmer body.

 To replace blade, align the guide 

rails of the blade assembly with 

the slots on the trimmer body and 

snap into place. Make sure blade is 

secure before turning on trimmer.

Rechargeable Operation 

(MB4040, MB4020)

Plugging in the adapter cord will not 

provide power to the trimmer, but 

only recharge the batteries. 

Zoom Wheel and Removable 

Adjustable Comb

NOTE: Adjustable Comb must be 

attached to the trimmer in order to 

use the Zoom Wheel.

The Zoom Wheel and Adjustable 

Comb ensures precise trimming and 

has nine adjustable positions:

Setting  Beard Style 

Length

  1 

Stubble look  1.5mm 1/16"

  2 

 

2.5mm 3/32"

 3 

Short  4mm 5/32"

  4 

 

5.5mm 13/64"

 5 

Medium  7mm 17/64"

 6 

 

9mm 11/32"

  7 

 

11mm 27/64"

  8 

Long 

14mm 35/64"

  9 

 

18mm 45/64"

Operating Your Trimmer

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6

2

4

7

1

3

5

10

8

9

MB4020, MB4040

Use and Care Guide

MB4040 (shown)

■ 

To adjust, roll the Zoom Wheel 

toward the top of the trimmer for 

a longer length, and toward the 

bottom of the trimmer for a shorter 

length. The wheel will click into 

one of nine positions.

 Begin trimming at one of the 

longest settings 8 or 9 to avoid 

accidentally trimming hair too 

short. As you become familiar with 

the settings, you can then select 

your desired length setting.

Adjustable Comb

Remove Adjustable Comb if you 

are: defining hairline edges such as 

sideburns, trimming the nape of your 

neck, trimming your beard line on 

front of neck, or if you want to clean 

cutter assembly.

To remove:

■ 

Be sure the trimmer is in OFF 

position.

 While holding trimmer in one hand, 

and holding the Zoom Wheel to 

prevent it from turning, gently pull 

the Adjustable Comb away from 

the trimmer. The comb  

can be removed and replaced  

on any setting.

To replace:

■ 

Be certain trimmer is in OFF 

position.

 While holding the trimmer in one 

hand, and holding the Zoom Wheel 

to prevent it from turning, slide the 

comb over the top of the trimmer 

until it “clicks” into position.

NOTE: The Adjustable Comb can only 

be placed on the trimmer one way; 

if it does not fit properly, remove and 

reverse it.

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