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2 Pack US to Japan Plug Adapter, 2 Prong to 3 Prong Outlet Adapter
One Beat

2 Pack US to Japan Plug Adapter, 2 Prong to 3 Prong Outlet Adapter

Bottom line: The One Beat 2 Pack US to Japan Plug Adapter ($15.98 on Amazon as of 2026-10-06): 1875W capacity (125V, 15A) runs laptops and small appliances; main trade-off: USB-C is 5V/3A only - no Quick Charge 3.0 or PD laptop charging.

$15.98

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Buy on Amazon — $15.98 Compare to similar accessories

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ 1875W capacity (125V, 15A) runs laptops and small appliances
  • ✓ 4 USB ports (2x USB-A, 2x USB-C) charge 7 devices at once
  • ✓ 3.0 x 2.4 x 1.6in cordless body is cruise ship approved

Cons

  • ✗ USB-C is 5V/3A only - no Quick Charge 3.0 or PD laptop charging
  • ✗ No surge protection, so risky for sensitive electronics
  • ✗ Does not convert voltage - 240V-only devices still need a converter
  • ✗ 5V/3.1A shared across 4 ports slows simultaneous charging

Manufacturer description

The One Beat 2 Pack US to Japan Plug Adapter converts standard 3-prong American plugs down to 2-prong Type A, the outlet standard used in Japan, the Philippines, Canada, Mexico, China, Thailand, Peru, and Panama. Each adapter handles up to 1875 watts (125V, 15A) and adds four USB charging ports - two USB-A and two USB-C - so you can power seven devices at once from a single wall outlet. Total USB output is 5V/3.1A, with smart auto-detection delivering up to 2.4A per USB-A port and 3A over USB-C. At 3.0 x 2.4 x 1.6 inches with no cord and no surge protection, this plug adapter is cruise ship…

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SpecPicks Verdict

SpecPicks scored One Beat 2 Pack US to Japan Plug Adapter using a rating × review-volume × price-fit model applied to published specs and reviews across the accessories category. One Beat's accessories lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for accessories of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Does this adapter convert voltage for use in Japan?

No. It is a plug shape adapter rated for max 125V and 15A, not a voltage converter. Japan runs 100V, so US 120V devices work fine, but anything needing 220-240V requires a separate converter.

Will my USB-C laptop or fast-charging phone charge at full speed?

No. The USB-C ports top out at 5V/3A and do not support Quick Charge 3.0 or any 9-22V charging profile, so fast-charge phones and USB-C PD laptops will charge at standard speed only.

Can I bring this on a cruise ship?

Yes. The adapter has no surge protection and no cords, which is the configuration cruise lines permit. It measures 3.0 x 2.4 x 1.6 inches and fits in a carry-on.

Which countries besides Japan does this work in?

Type A outlets are used in Japan, the Philippines, Canada, Mexico, China, Thailand, Colombia, Cuba, Guatemala, Guyana, Haiti, Liberia, Panama, Peru, and Anguilla.

How many devices can I run at the same time?

Up to seven - three through the outlet side plus four USB devices. Total draw across the outlet is capped at 1875 watts, and the four USB ports share 5V/3.1A.

Is it safe to leave plugged in overnight in a hotel?

The housing is built from material rated to 1382F and a blue indicator shows when power is on. Check the product listing for current warranty and certification details.

Key Features

  • 【Multi Plug Outlet Extender】- Outlet converter 2 prong to 3 prong standard American outlets, 2 USB-A and 2 USB-C charging port, Max Capacity Up to 1875 Watt (max 125 Volt, 15 A); 4 USB Ports can charge up to 3.1A, allowing you charge 7 devices simultaneously. Ideal for cell phone, tablet, power bank and other electrical chargers; No need to carry extra adapter and power strip for your traveling, a small plug adapter can save your suitcase space.
  • 【Japan Power Adapter】- Type A plug adapter can work in America for 3 prong to 2 prong adapter, it is also compatible in oversea such as Japan, Philippines, Canada, Mexico, China, Thailand, Anguilla, Colombia, Acosta Erica, Cuba, Guatemala, Guyana, Haiti, Liberia, Panama, Peru
  • 【US to Japan plug adapter】- This USA to Japanese plug adapter is mini and compact size: 3.0*2.4*1.6in, plug converter has no surge protection, no cords, making the Argentina plug adapter fully cruise ship approved; The blue indicator let you know the power is on/off.
  • 【USB C Fast Charge】- The USB Outlet Plug total output of 4 USB ports is 5V/3.1A. Built in smart technology, the multi plug outlet can auto-detect charged devices and deliver optimum charging speed up to 5V/2.4A (max) each port, USB-C up to 3A.( Please note The USB-C port is not Quick Charger 3.0, doesn't support any other devices which need 9~22V charging voltage.)
  • 【Suitable for Any Occasions】One beat travel adapter is made of 1382℉ fireproof material, it is safe and reliable for any indoor place, especially for the bedroom, bathroom and hotel. It’s also perfect for the holidays where you need extra outlets inside.

Full Specifications

BrandOne Beat
ColorWhite
Plug TypeType A
Unit Count2 Count
ConnectivityUSB-C
Model NumberOB3W3JPC2
Power SourceAC adapter
Input Voltage125 volts
Output Voltage5 volts
Item Dimensions2.4 x 1.6 x 3 inches
Mfr Part Number2176102b-3793-4432-99bf-0f2136c2bfb8
Number of Items2
Number of Packs2
Number of Outlets3
Warranty Description1 Year Manufacturer
Item dimensions L x W x H2.4 x 1.6 x 3 inches

Ready to buy?

2 Pack US to Japan Plug Adapter, 2 Prong to 3 Prong Outlet Adapter is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $15.98

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

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2 Pack US to Japan Plug Adapter, 2 Prong to 3 Prong Outlet Adapter
$15.98
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