Specifications:

Input: AC100V-AC240V 50~60Hz
Output: AC25.4V 4.5A 114W
AC Power Cable Length: 100cm / 3.3ft
AC Power Adapter Length: 95cm / 3.1ft
Net Weight: 463g / 1lb
Package Size: 22x12x5cm / 8.7x4.7x2in
Package Weight: 523g / 1.2lbs

Tips:

This is the rechargeable Lithium-Ion battery pack for the MAF066 model, and incudes an adapter cable for charging the battery when detached from the machine. (Please refer to the MAF066 manual for detailed charging instructions.)
In compliance with industry standards, this adapter and charging cable is equipped with multiple safety protections, including overvoltage, overcurrent, overheating, and short-circuit safeguards.

Please note: 

The accessories may be shipped separately from the oxygen concentrator, which will take 10-15 working days to deliver. The oxygen concentrators are usually shipped in 2-3 days after placing the order, and will arrive in about 3-5 working days.
The 30-day Return & Refund policy does not apply to this accessory product. Please read the description carefully or contact our Customers Service Team for more information.