CELYYPU MT-4000w 4000W Step-Up/Step-Down Voltage Transformer

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Product guide

CELYYPU MT-4000w 4000W Step-Up/Step-Down Voltage Transformer

Voltage: The CELYYPU MT-4000w is listed as a 4000W step-up/step-down transformer for converting between 110–120V and 220–240V AC. Its LCD, mixed outlet types and resettable breaker add useful convenience, but check the input/output details and appliance load limits before choosing it.

At a glance

The listing describes both voltage directions: 110–120V to 220–240V and 220–240V to 110–120V.
Three American sockets and three universal sockets provide a choice of outlet formats.
The LCD is described as showing input voltage and fault codes.
A resettable circuit breaker and several listed protection functions are included in the product claims.

Price

$127.99Save 15%

Reference price: ~~$149.99~~

Price checked: Nov 14, 2026

View offer

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Pros and cons

Pros

Bidirectional voltage conversion can serve appliances requiring either voltage range.
Six sockets across American and universal formats can accommodate different plug types.
A displayed input voltage and fault codes may help identify operating issues.
The manufacturer lists a resettable breaker and overload, overcurrent, overheating and short-circuit protections.

Cons

The listing states that appliances rated above 4000W are unsupported and recommends capacity exceeding the appliance load by more than 30%.

Technical specifications

16 specifications

Identity
Brand	CELYYPU
Model	MT-4000w
Color	blue

Power and conversion
Listed capacity	4000 watt
Input voltage	120 volts
Output voltage	230 volts
Conversion efficiency	90%
Output at 110V input	230V ± 5V
Output at 220V input	110V ± 5V
Maximum supported appliance rating	4000W

Outlets and display
Total outlets	6
Plug type	Type A
Screen technology listed	LCD

Protection and operating claims
Protection features	Overcurrent protection, overload protection, overheating protection, short circuit protection, built-in grounding protection, sturdy shell protection
Circuit breaker	Resettable circuit breaker
Continuous operation claim	7x24

What to know before buying

Listing details to confirm

The listing uses several different voltage descriptions: title references 110V/120V/220V/240V, details give 120 volts input and 230 volts output, and feature text describes broader voltage ranges with different input-specific outputs. Confirm the required direction and actual input/output configuration for your setup. The 4000W limit and recommendation for more than 30% headroom also mean the maximum rating should not be treated as a target load.

Who is it for?

A good fit for

People who need a listed step-up and step-down transformer for compatible AC appliances within its stated load limit.
Setups that benefit from a mix of American and universal sockets and an on-unit voltage/fault display.

Less suited to

Appliances rated above 4000W.
Buyers who need a precisely confirmed voltage configuration without first checking which input and output combination applies to their setup.

CELYYPU MT-4000w 4000W Step-Up/Step-Down Voltage Transformer · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 100 ratings

5 stars73%73%
4 stars15%15%
3 stars3%3%
2 stars0%0%
1 star9%9%

Customer feedback describes successful use with appliances such as a steamer and hair dryer, along with charging power stations, and mentions functionality and construction quality. That is encouraging for buyers considering similar loads, but it does not establish compatibility with every device or resolve the listing's differing voltage descriptions. Aggregate ratings are generally favorable, though a minority of ratings are at the lowest star level, and ratings alone do not explain the reasons.

Positive themes

Customer feedback mentions successful use with a steamer, hair dryer and other electronic devices.
Some feedback highlights functionality and construction quality, including use for charging power stations.

Frequently asked questions

Can this transformer step voltage up and down?

The listing claims conversion from 110–120V to 220–240V and from 220–240V to 110–120V. Its stated input and output figures vary across the listing, so confirm the exact configuration needed.

What load can it support?

The listing says appliances rated above 4000W are unsupported and recommends choosing a unit with capacity more than 30% above the appliance's power.

What outlets and display does it have?

The listing describes three American sockets, three universal sockets and an LCD that can show input voltage and fault codes.

What protections are claimed?

The listing names overcurrent, overload, overheating and short-circuit protection, built-in grounding protection, and a resettable circuit breaker.