Does it charge so it can used without being connected?

Yes, but unfortunately overtime your battery wears out and having it fully charged won’t matter, it will only last for about a good hour on top volume, but a lot longer if it’s at a medium volume.

Could you please tell me about the Connector Size?

I think connector is 5.5 mm in diameter

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AC Adapter for Harman Kardon Onyx Studio 1 2 3 4 5 6 7 Wireless Portable Speaker System Charger Power Supply Cord Plug Cable US Power Cable HK Onyx Aura Studio 5 4 3 2 1 Plus AirPlay Power Cord

Product ID: 42956461

Details

Amperage
2.1 Amps
Brand
KFD
Color
Black
Compatible Devices
Speakers
Connector Type
DC Jack
Included Components
USB Cable

⚡40W Power Output

🔌2.1A Current Rating

🔥V-0 Flame Retardant Safety

€ 41.19

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Description

🔋 Power Your Sound, Protect Your Vibe

SAFETY FIRST ALWAYS - Equipped with Over Voltage, Over Current, and Short Circuit Protections plus V-0 flame retardant casing for peace of mind in every charge.
PRECISION COMPATIBILITY - 100% OEM-matching design guarantees seamless fit with Onyx Studio 1-7, Aura Studio, and Go + Play models—no guesswork, just perfect power.
UNIVERSAL VOLTAGE RANGE - Supports 100-240V input, making it your reliable travel companion across all your work and play destinations.
POWER THAT KEEPS YOU GOING - Delivers a robust 40W output ensuring your Harman Kardon Onyx Studio stays charged and ready for every beat.
WARRANTY BACKED CONFIDENCE - Enjoy 30 days free exchange and a 36-month warranty—because quality and reliability are non-negotiable.

The KFD AC Adapter is a premium replacement charger designed specifically for Harman Kardon Onyx Studio and Aura Studio wireless speakers. Certified CE, FCC, and RoHS compliant, it delivers 19V at 2.1A with 40W power output, featuring advanced safety protections including over-voltage, over-current, and short circuit safeguards. Its flame-retardant build and universal 100-240V input make it a durable, travel-friendly power solution backed by a 36-month warranty.

Specifications

ASIN	B06WRT129K
Additional Features	Short Circuit Protection
Amperage	2.1 Amps
Brand	KFD
Built-In Media	USB Cable
Color	Black
Compatible Devices	Speakers
Compatible Phone Models	Harman Kardon Onyx Studio 1, 2, 3, 4, 5, 6, 7, Onyx Aura Studio 1, 2, 3, 4, 5, Go + Play wireless Bluetooth speaker Compatible Phone Models Harman Kardon Onyx Studio 1, 2, 3, 4, 5, 6, 7, Onyx Aura Studio 1, 2, 3, 4, 5, Go + Play wireless Bluetooth speaker See more
Connectivity Technology	Bluetooth,Wireless
Connector Type	DC Barrel
Current	AC
Current Rating	2.1 Amps
Customer Package Type	Standard Packaging
Customer Reviews	4.6 out of 5 stars 1,647 Reviews
Enclosure Material	fire-resistant plastic
Frequency Range	60 hertz
Included Components	USB Cable
Input Voltage	240 Volts
Item Weight	0.25 Kilograms
Main Power Connector Type	2 Pin
Manufacturer	KFD
Mfr Part Number	LAC-029-US
Model Number	LAC-029-US
Mounting Type	Wall Mount
Number of Items	1
Number of Power Levels	1
Output Current	2.1 Amps
Output Voltage	19 Volts
Portable	Yes
Power Plug	Type A - 2 pin (North American)
Power Source	Corded Electric
Special Feature	Short Circuit Protection
Specification Met	CE, FCC, RoHS
Total Usb Ports	1
UPC	709445195493
Unit Count	1.0 Count
Wattage	40 watts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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€ 41.19

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Italy.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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