1 / 7Grestar UK to Japan Type A Travel Adapter, 4 USB Ports
Type: Grestar’s UK to Japan travel adapter combines one AC socket with two USB-C and two USB-A ports for charging several devices from one outlet. It is a plug adapter, not a voltage converter, so devices must support the local supply voltage.
At a glance
- One AC socket and four USB ports, comprising two USB-C and two USB-A.
- The listing claims up to five devices can be connected at once.
- The listed USB outputs are 5V/3A for USB-C and 5V/2.4A for USB-A.
- The claimed UK Type G to Japan Type A plug conversion does not convert voltage.
Reference price: £11.99
Price checked: 12 Nov 2026
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Pros and cons
Pros
- Four USB ports alongside an AC socket can reduce the need to bring separate USB chargers.
- A single adapter is claimed to support charging up to five devices at the same time.
Technical specifications
11 specifications| Brand | grestar |
|---|
| AC outlets | 1 |
|---|---|
| Plug type | Type G |
| Output voltage | 240 Volts |
| USB-C output | 5V/3A |
| USB-A output | 5V/2.4A |
| Input range and maximum load | 100V–250V & 10A (max 2500W) |
| Destination plug format | Japan 2-flat-pin (Type A) |
| Dimensions listed | 6.5 x 5 x 5 centimetres |
|---|---|
| Weight listed | 20 Grams |
| Alternative dimensions stated in features | 7 x 5.5 x 5 cm |
What to know before buying
- This is not a voltage converter. Check that each device supports the destination voltage range before plugging it in, especially heating or grooming appliances.
Listing details to confirm
The listing is inconsistent about dimensions, giving 6.5 x 5 x 5 centimetres in product details and 7 x 5.5 x 5 cm in feature text. It also gives 100V-240V in the title, 100V–250V & 10A (max 2500W) in a feature, and 240 Volts as output voltage in details. Confirm the applicable electrical ratings and size for the selected listing before purchase. The claimed protection features are not independently confirmed.
Who is it for?
A good fit for
- Travellers from the UK who need a Type A plug adapter for Japan and want USB-A, USB-C and one AC socket in one unit.
- People carrying several USB-charged devices who want the listing’s claimed five-device capacity.
Less suited to
- Anyone needing voltage conversion for a device that is not compatible with the destination supply.
- Travellers who need confirmed dimensions or electrical ratings without checking the listing, given the conflicting figures.
Customer reviews on Amazon
- 5 stars
65% 65% - 4 stars
8% 8% - 3 stars
6% 6% - 2 stars
6% 6% - 1 star
15% 15%
The supplied evidence contains aggregate ratings but no customer-comment summary, so it does not show what buyers praised or criticised. The ratings are mostly in the five-star category, but lower-star ratings are also present. Treat this as a limited indication of overall reception, not evidence about USB performance, fit or voltage compatibility.
Frequently asked questions
Does this adapter convert voltage?
No. The listing says it is not a voltage converter. Use it only with devices rated for the local supply voltage or a compatible input range.
Which ports and sockets does it have?
The listing describes one AC socket, two USB-C ports and two USB-A ports, with a claimed capacity of up to five connected devices.
What USB output ratings are listed?
The feature text states 5V/3A for USB-C and 5V/2.4A for USB-A. It does not establish how output is shared when several ports are used together.
Are its dimensions clear?
No. Product details state 6.5 x 5 x 5 centimetres, while feature text states 7 x 5.5 x 5 cm. Check the selected listing if size matters.
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