TESSAN 延長コード 5m 超薄型 (8-in-1

The TESSAN 5m Ultra-Slim 8-in-1 extension cord packs 4 AC outlets and 4 USB ports into a body just 2.6 cm thick.

Its appeal is a specific combination — slim enough to slide under furniture, a 5 m cord long enough to cross a room, and four USB ports. Its 1500W total limit, however, is the same as any ordinary strip, so it is not a fit for heat-producing appliances.

Overview

This is an 8-in-1 power strip: 4 AC outlets plus 2 USB-C and 2 USB-A ports. The USB-C ports support Power Delivery at 20W, enough for fast-charging phones and tablets.

The target user is clear — someone powering several small devices at a desk or bedside.

As captured in May 2026, the Amazon.co.jp listing showed 2,618 reviews averaging 4.3 out of 5 (roughly 86% positive).

That is solid for this price class, but review counts and scores shift over time, so check the current distribution yourself before buying. Power strips are a category where unit variance and early failures move ratings noticeably.

The 2.6 cm thickness is the number that decides whether the strip fits under a bed frame, a sofa, a monitor riser, or the edge of a rug.

The 165 g weight helps portability, but it also means the strip lifts easily when several thick AC adapters tug at it. Plan to anchor it with cable routing.

Compatibility Guide

Rated at AC 100V with a 1500W total load, it plugs into any standard Japanese wall outlet. Per the manufacturer, it is not intended for overseas use — hotel voltages abroad range from 110V to 240V, and a 100V-only device is unsafe there.

Treat it as a domestic-travel accessory.

The 1500W ceiling arrives faster than people expect. As rough figures, a laptop adapter draws 60–100W, a desktop PC 200–500W, a monitor 20–50W.

That combination leaves headroom. But kettles, oil heaters, hair dryers, and microwaves routinely exceed 1000W on their own, consuming nearly the entire budget in one plug.

Read the spec as "four outlets sharing 1500W," not "four independent outlets."

The 36 mm socket spacing is generous for a slim strip — many competitors sit at 25–30 mm, where a bulky wall adapter blocks its neighbor. It is not immunity, though: adapters wider than about 5 cm will still cover the next socket.

A short pigtail extender for the bulky adapter solves this reliably.

On the USB side, USB-C delivers up to 20W (PD) and USB-A up to 12W (5V/2.4A), with Smart IC selecting output per device.

20W covers iPhones, mainstream Android phones, tablets, handheld consoles, cameras, and earbud cases. It does not cover laptops that expect 60W or more over USB-C — nothing breaks, but the machine will charge slowly or not at all while in use.

Plug laptops into the AC side with their own adapter.

One gap worth noting: the total combined USB output when all four ports are in use is not stated in the data available here. Devices like this typically cap combined output, so per-port speed drops when all ports are loaded.

If simultaneous fast charging is your reason for buying, verify the combined-output figure on the product page.

Product Info

TESSAN specializes in power accessories, and this model pairs an 8-in-1 layout with a slim body. It sits in the entry-to-mid segment, keeping the price down while combining USB fast charging with a long cord.

It ships with no extra accessories, and warranty is typically one year (seller-dependent).

On pricing: the Amazon listing showed ￥2,899 as captured on 22 May 2026, and Rakuten (Hellodear store) showed ¥3,679 as captured on 22 August 2026. Both are point-in-time figures that move with sales, coupons, and stock.

Check the current price on the product page before ordering — with points factored in, which store wins depends on conditions.

How It Compares

USB power strips diverge sharply in design philosophy. This one wins on a specific trio: thin body, long cord, four USB ports.

Competitors usually drop one of the three.

Heavier desk-bound strips with surge protection, per-outlet switches, and magnetic mounts beat it on features at the cost of bulk. If the strip never moves, those are more pleasant to live with.

At the other end, corner taps and direct-plug adapters save space but often omit USB or a cord entirely. If everything sits right at the wall socket, a small tap is enough and this model loses its point.

The available data lists no per-outlet switches and no surge protection for this model. If you live somewhere lightning-prone or plan to connect expensive gear, look for a product that states surge protection explicitly.

Consider it the trade-off made for thinness.

Setup Tips

Five meters is useful but leaves slack to manage. Avoid running it coiled, especially under loads approaching 1000W, since a tight coil traps heat.

Route it along a wall or fold it loosely behind furniture instead.

Place heavy AC adapters at the end sockets and keep the USB side within reach. Because the strip is light, stiff cables push it out of position — a cable clip or hook-and-loop strap under the desk keeps it put.

At a bedside, route the cord so rolling over cannot yank it.

Best Use Cases

The best fit is a desk or bedside powering several small devices — phone, tablet, earbuds, monitor, desk lamp. Four AC outlets and four USB ports land almost exactly right for that mix.

Second, rooms where the outlet is far away. The 5 m cord matters in rentals with fixed socket positions, bedrooms where the bed sits away from the wall, and low-table workspaces.

One long cord beats two chained extensions for both contact reliability and heat.

Third, anyone routing power under furniture — 2.6 cm has a good chance of clearing a bed, sofa, or cabinet, though you should measure first.

Frequent domestic travelers also benefit, since one unit turns a single hotel socket into eight. It cannot be used overseas.

Before You Buy

Not for heat-producing appliances. Kettles, heaters, dryers, and microwaves each pull around 1000W.

They fill the 1500W budget immediately, and sustaining that load through a slim strip is not advisable. Keep it away from kitchen and washroom duty.

Not enough for USB-C laptop charging. 20W is a low PD tier; most thin laptops want 45–100W.

Buying this expecting to power a laptop from USB-C will disappoint.

Verify combined USB output. As noted, the combined figure is not in the data here.

Expect per-port speed to fall when all four ports are loaded.

No surge protection or individual switches are listed. If you want to cut standby power per outlet or care about lightning protection, choose a model that states those features.

Japan only. It is AC 100V rated; pairing it with a travel plug adapter abroad is not safe.

Check the listing details yourself. Online product pages sometimes carry seller, model-number, or category metadata that disagrees with the actual item — on this listing, the store label attached to one price did not match the linked storefront.

Before ordering, cross-check the product images, title, and spec table to confirm you are getting the 4 AC + 4 USB layout with a 5 m cord. TESSAN sells similar model numbers with different port counts and cord lengths, and that is exactly where a "it arrived with a 3 m cord" mistake happens.

FAQ

Q. Can it charge a laptop? A.

Not adequately from the 20W USB-C port. Plug the laptop's own AC adapter into an AC outlet; that works fine within the 1500W total.

Q. What happens when all four USB ports are used at once? A.

Products like this generally cap combined output, so per-port speed drops. The combined figure is not in the data available here — check the product page if simultaneous charging matters.

Q. Can I plug in a microwave or heater? A.

Not recommended. Each occupies roughly 1000W of the 1500W budget, and sustained high loads on a slim strip should be avoided.

Use a wall socket directly.

Q. Will a large AC adapter block the next socket? A.

The 36 mm spacing is wider than average, so standard adapters usually clear. Adapters wider than about 5 cm can still block a neighbor.

Q. Can I take it abroad?
A. No. It is rated for AC 100V only and is not intended for 110–240V environments. Use it for domestic travel.

Q. Can I use it while coiled? A.

Avoid it under heavy load. A coiled 5 m cord carrying high current traps heat.

Run it along a wall or fold it loosely so it can dissipate.