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Powerstar, Inc.

Attn: Mr. Timothy Carr 9073 Shady Grove

Gaithersburg, MD 20877-1301 Dear Mr. Carr,

Communication Systems-East

I Federal Street Camden , NJ 08103 U SA


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25 July 2011

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This letter is to acknowledge the superior support we received from PowerStar employee Peter El Koury and yourself during our development and testing program of the Integrated Communications System for U.S. Navy platforms.


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L-3 Communication Systems-East has relied upon PowerStar UPS components for a U.S. Navy communications system that was recently designed, developed, and tested per very stringent, rigorous environmental qualification specs. The PS6003RM2u-18-A-H Controller and PS6003rm2uBP-A-H Battery Trays, whi talled in a shock-isolated and EMI-sealed rack, have successfully passed the following environmental tests: .


EMI I EMC


Air Temp Humidity Vibration

DC Mag Field Power

Pressure (Tray Only)


Noise-Airborne

MIL-STD-461:

CS06, RS02, CE101, CE102, CS101, CS114, CS116, RE101, RE102,RS101, RS103


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MIL-STD-810F CN3, Operational 0-40C, and Storage -20-60C MIL-STD-810F Modified 507.4, 90%@ 40C "


MIL-STD-167-1, 4 to 14Hz


DOD-STD-1399 Section 70 - Part 1, Notice 1 MIL-STD-1399

MIL-STD-810(F) Change Notice 3, Method 500.4, Procedure 11-

0peration (24 and 36 inches Hg) MIL-STD-740-1

Noise-Structure MIL-Si;D-740-2


Shock


MIL-STD-901D, Heavyweight Impact Testing


Our environmental qualification test program was successful, thanks in part to Powerstar's efforts. We appreciate the excellent support you and your team provided, and we look forward to continued business with Powerstar in the production phase of this program.


Sincerely,

Tf1-/{ov<-/ ,-ft)


Thomas A. Rachfalski

Program Manager, U.S. Navy Integrated Communications Office: 856-338-4246

Cell: 856-397-0037