What is the diameter of the barrel connector?

Checked with a cheap digital micrometer. OD is 5.45mm, ID is roughly 2.25-2.99mm, depending on the placement of the micrometer prongs.

can this charge a sony dr bt21g headset?

I don't know, I used them to charge Turtle Beach headsets since they only required a 5 volts.

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Overview

Specs

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Charge your 5V DC devices using your computer USB port - usb to 5.5mm - usb to 5

Details
Connector Number	2
Connector Detail	USB to Type M Barrel 5V DC Power
Specifications	Connector on First End: 1 x USB Male Connector on Second End: 1 x DC Jack Voltage Rating: 5 V DC

Features
Features	Connector on First End: 1 x USB MaleConnector on Second End: 1 x DC JackVoltage Rating: 5 V DCCord Length: 3 ftColor: BlackGreen Compliant: YesGreen Compliance Certificate/Authority: RoHSLimited Warranty: 2 Year

Plug Standards
Electrical Outlet Plug Type	Plug Type “A” (USA, Canada, Mexico, Japan)

Additional Information
First Listed on Newegg	August 03, 2010