Will the adaptor work on a USA 2 prong plug or only a 3 prong?

Works on either. The phone/tablet chargers we plugged into it had 2 prong plugs. Make sure that adapters will handle 220 to 110 volt current, though. Most newer ones do, but it will be printed in mice type on the adapter.

Does this plug accept polarized two-pronged plugs? (those with one blade wider than the other)

Yes. I just looked at the one I ordered and one side is clearly larger than the other. I also plugged cell phones, laptops, and other high power electronics and it worked fine for all of them. I imagine at least one of those had to have a polarized plug.

Does it work well with 3-prong US adapters over months of use? (Will be Australia for a few months and need it for charging laptop)

3-prong US adapters fit very well into this converter. I only used my adapter for five weeks, but during that time I saw no indication of fatigue problems or anything that might affect it working for months.

how many devices can you plug into each adapter plug?

You can plug two devices into the adapter.

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Type B Plug Adapter 4 Pack – Europe, UK & China to USA, Grounded

Product ID: 2876091

Details

Brand
OREI
Color
Black
Input Voltage
250 volts
Item Weight
68 g
Item dimensions L x W x H
1 x 1 x 1

🌍Universal socket for global compatibility

🔌2-in-1 dual plug acceptance

🛡️Grounded safety with lifetime warranty

$U875

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌐 Plug in anywhere, power up everywhere—travel smart, stay connected!

GLOBAL READY - Universal socket fits plugs from Europe, UK, China & more—travel without limits (except Type M).
GROUNDED SECURE - Built-in grounding ensures safe, reliable power for your devices wherever you go.
TRUSTED DURABILITY - Backed by a lifetime limited warranty—invest once, travel forever with confidence.
DUAL PLUG POWERHOUSE - Accepts 2 plugs simultaneously—universal socket plus Type B grounded plug for seamless USA compatibility.
COMPACT 4 PACK CONVENIENCE - Four sleek, pocket-sized adapters keep all your essential devices charged on the move.

The OREI Type B Plug Adapter 4 Pack offers a versatile 2-in-1 design with a universal socket and grounded Type B plug, enabling seamless use of European, UK, and Chinese plugs in the USA and other Type B regions. Compact and durable, this set supports up to 250V input and 125V output, perfect for charging laptops, smartphones, and other devices. Note: it is not a voltage converter. Comes with a lifetime limited warranty for reliable travel power solutions.

Specifications

ASIN	B00DTRHB5I
Best Sellers Rank	#121,142 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #405 in Electrical Adapters
Brand	OREI
Color	Black
Customer Reviews	4.5 out of 5 stars 505 Reviews
Global Trade Identification Number	00045635947962
Input Voltage	250 volts
Item Dimensions	1 x 1 x 1 inches
Item Highlight	Europe to US Plug Adapter, UK to US Plug Adapter, Type B Adapter, Universal Socket, Grounded 4-Pack, DB5_4PK_BLK
Item Weight	68 g
Item dimensions L x W x H	1 x 1 x 1 inches
Manufacturer	Orei Products
Manufacturer Contact Information	[email protected]
Mfr Part Number	P21-5-4PK
Model Number	P21-5-4PK
Number of Items	4
Number of Outlets	2
Number of Packs	4
Output Voltage	125 volts
Packer Contact Information	[email protected]
Plug Type	Type B
UPC	045635947962
Unit Count	4 Count
Warranty Description	1 Year Warranty

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