Overview

The Belkin BSV401af2M combines four AC outlets, two USB charging ports (2.4A shared), and 525 joules of surge protection in a single 2-meter extension lead.

The cable is long enough to run from a wall socket up to a desktop, but not across a room. The key point up front: this unit is built around the British BS 1363 (Type G) standard.

It is not a product you can plug into a Japanese wall socket and use as-is.

That said, the Amazon.co.jp listing carries 1,271 reviews at 4.6 out of 5 stars — roughly 92% positive, which is high for an extension lead.

The product itself is well made. The entire buying decision comes down to one question: is your environment Type G or not?

This article focuses on that, plus the pitfalls people discover after the box is open.

Compatibility Guide

The four outlets are BS 1363 (Type G). Japanese two-pin (Type A) plugs will not fit.

The rated voltage is 240V, so Japan's 100V supply poses no electrical problem — the obstacle is purely physical shape. Using this unit in Japan requires adapters at two separate points.

Location What you need Watch out for
Unit's own plug Type G → Type A adapter Earth may not carry through on Japanese sockets
Each outlet (up to 4) Type A → Type G adapter One per outlet; thickness can block neighbours

As the table shows, full use requires up to five adapters. Adapters are bulky, so you may not be able to fill all four outlets simultaneously.

This is the single biggest practical constraint on using the unit in Japan.

Surge protection deserves a caution too. Surge suppression works by diverting excess voltage to earth.

If you connect through an adapter to an ungrounded Japanese two-pin socket, the protection may not behave as designed. Treat the 525-joule rating as a figure valid in its intended installation environment.

If surge protection is your main goal in Japan, a locally designed, properly earthed unit is the safer choice.

The USB side provides 2.4A shared across two ports.

With one port occupied you get practical charging speeds for a modern phone; with both in use, each effectively drops to around 1.2A.

There is no USB Power Delivery and no USB-C, so laptop and tablet fast charging are out of scope. Think of it as a parking spot for phones, earbuds, smartwatches, and e-readers.

A two-pole switch system lets you cut power to everything at once — handy for killing standby draw on TV and console peripherals.

Product Info

Core specifications: four AC outlets, 525-joule surge protection, 2.4A total USB output, 2-meter cable, 240V rating, Type G (BS 1363) plug.

Belkin has a long track record in power accessories, and the unit carries a Connected Equipment Warranty, which covers connected devices damaged when surge protection fails. Terms and eligible regions are set by the manufacturer, so confirm whether a unit bought in Japan qualifies before you rely on it.

As captured on 2 September 2026, the Amazon.co.jp price was ￥14,295.

For a four-outlet, two-USB extension lead, that is well above the going rate for domestically sold equivalents in Japan. The gap likely reflects import and distribution costs rather than the hardware itself.

Extension lead prices swing with stock and seller, so always check the current price on the product page — the figure here is a point-in-time snapshot.

The 1,271 reviews at 4.6 stars indicate a long-selling staple in its home market.

Bear in mind that most of those reviews come from Type G users and say nothing about how convenient the unit is in Japan.

Setup Tips

Two meters reaches from a wall socket up to a desktop or around a TV cabinet, not across a room. Measure the actual run before ordering.

If you use adapters, watch the weight balance. An adapter-stacked plug puts extra leverage on the socket, and a partially seated plug can heat up from contact resistance.

Prefer a floor-level extension or a stable desktop position over plugging directly into a vertical wall socket.

Respect total load. Avoid consolidating heaters, kettles, or hair dryers onto this or any similar lead.

It is designed for low- to medium-draw desk equipment.

How It Compares

Four axes matter when comparing surge-protected leads. First, joule rating: a few hundred joules handles everyday voltage spikes, but not a direct lightning strike.

Second, outlet spacing — bulky AC adapters routinely block neighbouring sockets. Third, USB quality: shared versus per-port output, and PD support or not.

This unit is shared and non-PD. Fourth, and decisive for buyers in Japan, plug standard.

A domestic Type A model needs no adapters at all and often costs less for equivalent features. The rational reasons to pick this unit are narrow: you are in a Type G environment, or you specifically want Belkin and its connected equipment warranty.

Best Use Cases

  • Living or staying in a Type G region (UK, Ireland, Hong Kong, Singapore) — no adapters, full designed performance.
  • Running Type G devices inside Japan — adapt only the unit's own plug and you gain four native Type G outlets without per-device adapters.
  • Consolidating low-draw desk gear — four outlets plus two USB ports is a sensible balance for PC peripherals and phone charging.
  • Buyers who value the Belkin name and its connected equipment warranty — a reasonable way to choose power hardware.

If you simply want to plug Japanese devices into Japanese sockets, there is no reason to buy this. A domestic surge protector costs less, needs no adapters, and earths correctly.

Things to Check Before Buying

The plug standard is the main trap. Buying this from photos alone, as a "handy four-outlet lead with USB," ends with a unit that fits none of your Japanese devices.

Full use needs up to five adapters, whose cost and bulk are not included in the price. Confirm the plug shape of everything you intend to connect.

Surge performance is environment-dependent. Without a proper earth, the 525-joule figure cannot be taken at face value.

If surge protection is your primary motive, this is not the first choice in Japan.

Do not overestimate the USB charging. 2.4A shared and non-PD is modest by current standards.

It will not power a laptop, will not fast-charge a recent phone, and offers no USB-C.

Judge the price case by case. ￥14,295 as captured on 2 September 2026 is expensive for this feature set.

The premium appears to be import-related, and it moves with seller and stock. Compare against domestic equivalents before deciding.

Read the listing details carefully. The seller and shipper are a third-party marketplace account rather than the manufacturer.

Accessories, warranty handling, and even the exact variant shipped can differ by seller, and listing metadata sometimes disagrees with the physical product. Verify the target product from the photos and title, and ask the seller about anything unclear before ordering.

FAQ

Q. Can I use it on Japan's 100V supply? A.

Electrically yes — it is rated to 240V. But the Type G plug needs an adapter, and Japanese devices need adapters at each outlet as well.

Q. How many adapters do I need? A.

One for the unit's plug plus up to four for the outlets — five total. Adapter thickness may reduce how many outlets you can actually use at once.

Q. How strong is 525 joules? A.

Practical against everyday spikes and switching noise, but not a guarantee against a direct lightning strike. It also assumes a working earth connection.

Q. Can it charge a laptop over USB?
A. No. Output is 2.4A shared with no USB PD. It suits phones, earbuds, and smartwatches.

Q. Does the connected equipment warranty apply in Japan? A.

The warranty exists, but terms and covered regions are set by Belkin. Check the conditions before purchase, especially for an imported unit.

Q. Can I plug in a heater or hair dryer?
A. Not recommended. Connect high-draw appliances directly to a wall socket.

Product Disclosure (Amazon)

  • Manufacturer: Belkin
  • Seller: LUCIA SHOP
  • Fulfilled by: LUCIA SHOP
  • ASIN: B00OE43I9S
  • Note: This article covers a manufacturer-made product based on Amazon listing details.