Grestar UK to USA Type B Travel Adapter, 1 AC Socket and 4 USB Ports

Grestar’s UK to USA travel adapter combines one Type B AC socket with two USB-A and two USB-C ports for charging while travelling. It is an adapter, not a voltage converter, so connected appliances must support the destination voltage.

At a glance

One AC socket and four USB ports provide connection options for multiple devices from one wall outlet.
The listing says it can charge up to five devices simultaneously. Combined USB output is listed as DC 5V 3.4A, 15W-17W.
Compact dimensions are listed as 7x5x7 cm.
The listed destination compatibility includes the USA, Canada and Mexico, among other countries. Japan is explicitly excluded.

Price

£8.39Save 16%

Reference price: ~~£9.99~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

Four USB ports alongside one AC socket can reduce the number of separate charging plugs needed.
Useful for travellers taking several USB devices, with customers reporting compatibility and multi-device charging.

Cons

It does not convert voltage, which limits use with appliances that are not rated for the local supply.

Technical specifications

12 specifications

Identity
Brand	grestar
Model	SF20251007B0FFMHMJVC_B0FFMHMJVC_3_2MUWii

Connections and electrical details
Plug type	Type B
Number of outlets	1
Input voltage	100 Volts (AC)
Output voltage	120 Volts (AC)

Charging
Port configuration	1 AC socket + 2 Type C +2 USB A
Maximum USB-C output per port	3.0A Max
Maximum USB-A output per port	2.4A Max
Combined USB output	DC 5V 3.4A, 15W-17W

Physical details
Dimensions	7x5x7 cm
Colour	White

What to know before buying

This is a plug adapter, not a voltage converter. The listing says appliances used abroad should support dual or multi-voltage input from 100-250V.

Who is it for?

A good fit for

Travellers from the UK who need a Type B plug adapter for the USA, Canada or other listed destinations.
People wanting to charge several USB devices from one wall outlet.

Less suited to

Users who need a voltage converter for appliances that do not support the destination voltage.
Travellers going to Japan, which the listing says is not supported.

Grestar UK to USA Type B Travel Adapter, 1 AC Socket and 4 USB Ports · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 98 ratings

5 stars80%80%
4 stars13%13%
3 stars3%3%
2 stars1%1%
1 star3%3%

Customer feedback highlights perceived compatibility and functionality, including use on trips to the USA, as well as the convenience of charging several devices from one wall outlet. These reports align with the listed Type B socket and four USB ports, though the stated combined USB output is 15W-17W. Feedback also describes the adapter as good value, while aggregate ratings include a small lower-star portion, so experiences are not uniformly positive.

Positive themes

Customers report that the adapter works for trips to the USA and can charge several devices from one wall outlet.
Customer feedback describes it as good value for money.

Frequently asked questions

Does this adapter convert voltage?

No. The listing states that it is not a voltage converter. Check that each appliance supports the local supply, with the listing advising a 100-250V input range.

How many devices can it charge at once?

The listing claims up to five devices, using the single AC socket and four USB ports. It specifies combined USB output of DC 5V 3.4A, 15W-17W.

Can I use it in Japan?

The listing explicitly says Japan is not included in its destination compatibility.