N2Power Announces the XL375 Ultra-Compact 3.3" x 5" AC-DC Power Supply Family

Industry-Leading Power Density and 93% Efficiency for the OEM Market
SIMI VALLEY, Calif.--(Business Wire)--
N2Power, a Qualstar Company (NASDAQ: QBAK), today announced the first models of
the XL375 Series, a family of very compact, 375 watt AC-DC switching power
supplies. Seven models deliver output voltages from 12V to 56V, and up to four
units can be wire-ORed together to increase the total main output power up to
1,400 watts.

Leveraging N2Power`s unique "green" packaging technology, the XL375 Series
supplies deliver more power in less space, while reducing wasted input power and
lowering cooling requirements. N2Power`s patented design leaves the heat in the
load, not in the power supply, reducing power consumption, improving reliability
and lowering the cost of ownership.

The XL375 family is designed for OEM applications such as industrial automation,
telecommunications, gaming systems, security and surveillance systems, and
network servers. The XL375 Series delivers 375 watts of output power from just
16.5 square inches of system design real estate. Very low profile packaging
yields more than 15 watts per cubic inch power density in less than 1U, making
the system designer`s job much easier.

"The XL375 Series delivers greater efficiency and packs more power in a smaller
package than any other product on the market. This gives our OEM customers a
distinct packaging benefit, while also reducing overall power consumption and
cooling requirements," said Randy Johnson, N2Power business unit manager. "Our
unique technology gives OEM engineers new flexibility in power system design
that pays real competitive dividends in their final products."

The XL375 Series incorporates the same industry leading features as its widely
regarded XL125, XL160 and XL275 power supply families, including active power
factor correction for reduced input power, active inrush current protection,
active current sharing circuitry and remote on-off. Notably, the XL375 Series
allows both 5V standby and 12V auxiliary outputs to be wired Or-able when the
main output is disabled. Finally, synchronous rectification delivers
exceptionally high efficiency: up to 93% in some models.

N2Power supplies meet a full range of international agency requirements,
including RoHS, UL, DEMKO, CE Mark and FCC Class B.

N2Power`s XL375 family of power supplies is sold worldwide through its network
of representatives and distributors. Sample units are available. Call
805-583-7744 or visit www.n2power.com for further information.

About Qualstar Corporation

Qualstar manufactures automated tape libraries and power supplies. Its products
are known throughout the world for energy efficiency and rugged, Simply Reliable
designs yielding years of trouble-free operation. Qualstar tape libraries are
sold, installed and supported worldwide to backup, archive and protect data from
incidental and catastrophic loss. Its N2Power brand switching power supplies are
sold worldwide to OEM manufacturers who require both industry-leading high power
efficiency and very small size for their products. Qualstar Corporation is
publicly traded on the NASDAQ National Market under the symbol QBAK. More
information is available at www.qualstar.com, www.n2power.com or by phone at
805-583-7744.

Forward-Looking Statements

Statements concerning the future business, operating results and financial
condition of the Company are "forward-looking" statements as defined in the
Private Securities Litigation Reform Act of 1995. Such statements are based upon
management`s current expectations and are subject to a number of uncertainties
that could cause actual performance and results to differ materially from the
results discussed in the forward-looking statements. Factors that could affect
the Company`s actual results include the Company`s ability to increase sales of
its tape libraries; rescheduling or cancellation of customer orders; unexpected
shortages of critical components; unexpected product design or quality problems;
and, adverse changes in market demand for tape libraries or other Qualstar
products. The Company undertakes no obligation to publicly update any
forward-looking statements whether as a result of new information, future events
or otherwise. Further information on these and other potential factors that
could affect the Company`s financial results or condition are included in
Qualstar`s filings with the Securities and Exchange Commission. In particular,
reference is made to the "Risk Factors" section of the Company`s Annual Report
on Form 10-K for the fiscal year ended June 30, 2008, and to the "Management`s
Discussion and Analysis of Financial Condition and Results of Operations"
sections of its Form 10-K and its most recent Quarterly Report on Form 10-Q.

Qualstar Corp.
Bob Covey, 805-583-7744
covey@qualstar.com

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