RFM Delivers much Anticipated Module Allowing Field Device Suppliers to Add WirelessHart to their Solutions Integrates Dust Networks’ Industry-Leading IA-510(H) WirelessHART Technology

DALLAS, TEXAS, (June 1, 2010) RF Monolithics, Inc. (NASDAQ: [RFMI], “RFM” or “the company”) expanded its M2M portfolio of wireless communications products today by adding a new WirelessHART-compliant RF module – the XDM2510H – to the company’s industrial-grade RF module products. Built on the Dust Networks®’ IA-510(H)™ WirelessHART® system, the XDM2510H is compliant with the international IEC 62591 (WirelessHART) standard and enables industrial automation vendors to meet the rapidly growing demand for standards-based wireless sensor networking (WSN) solutions. WirelessHART has emerged as the dominant standard for process automation allowing battery-powered sensors to be deployed in previously hard-to-reach locations while providing wire-like reliability.

“RFM is pleased to be offering Dust Networks’ leading WirelessHART technology in module form allowing field device manufacturers of all sizes to add WirelessHART capability to their products, quickly, simply, and economically,” said Tim Cutler, Director of M2M products. “RFM believes the WirelessHART standard can truly offer high reliability, battery operated, wireless connectivity in the difficult industrial environments where it will be deployed.”

“RFM has an excellent track record of integrating Dust Networks’ technology into pre-certified modules,” said Brenda Glaze, Vice President Sales and Marketing for Dust Networks. “Their module technology platform makes it easy for design engineers to integrate WirelessHART into end-products, and further expands the worldwide availability of WirelessHART solutions.”

The Dust Networks’ IA 510(H) WirelessHART technology is widely recognized as a foundational building block of the WirelessHART standard. The RFM XDM2510H incorporates Dust Networks’ technology and offers original equipment manufactures (OEMs) a quick path to market for field devices that are enabled with WirelessHART protocol.

The XDM2510H module provides a UART serial port for connection to sensors and an RF connector for antenna connection thereby removing the need for any RF engineering by OEMs, and with the XDM2510H module certifications in the USA, Canada and Europe (pending), no type acceptance testing is required of the OEMs’ end products. RFM’s XG2510HE gateway product completes the network solution allowing connection either locally or anywhere across the Internet.

As with all the company’s RF module products, RFM offers a developer kit (XDM2510HDK) to help design engineers fast-track their designs. The XDM2510HDK includes 4 XDM2510H modules, 4 XDM2510H development boards, 1 XG2510HE gateway, 1 Ethernet cable, 5 Serial cables, 9V Batteries and Wall-mount Power Supplies for each development board, Antennas and RF Cables, Software and Manuals CD, and Quick Start Guide. The XDM2510HDK developer kit will be available by the end of June 2010 from RFM distributors Acal, Avnet, Digi-Key, Mouser Electronics, Nu Horizons, and Welotec (in Germany).

RFM offers one of the broadest ranges of wireless sensor networking platforms in the market. Design engineers looking for RF module solutions look to RFM first as the company has earned a reputation for outstanding support of the integration of their technology. In addition to the XDM series of products, RFM’s M2M portfolio includes battery-powered Wi-Fi^TM, ZigBee® / 802.15.4, Proprietary Mesh, and Proprietary FHSS RF modules and boxed radios.

About Dust Networks

Dust Networks, the leader in standards-based intelligent wireless sensor networking (WSN), provides ultra low-power, highly reliable systems to OEMs. Dust Networks wireless technology enables unprecedented access to information from the physical world, in markets that range from industrial monitoring and control to emerging markets such as the Smart Grid, Smart Cities and Smart Buildings. Dust Networks’ embedded products combine extremely low-power RF System-on-Chip (SoC) technology with revolutionary wireless networking capabilities, providing OEMs with a full range of standards-based WSN solutions that are flexible and easy to integrate. Dust Networks partners with industry and standards groups such as the HART Communication Foundation, IEEE, IETF, IPSO, ISA, SunSpec Alliance and the Zigbee Alliance to ensure the broad adoption of interoperable wireless sensor networking products. To learn more about Dust Networks, please visit www.dustnetworks.com.

About RFM

RF Monolithics, Inc., headquartered in Dallas, Texas, is a provider of solutions-driven, technology-enabled wireless connectivity for a broad range of wireless applications—from individual standardized and custom components to modules for comprehensive industrial wireless sensor networks and machine-to-machine (M2M) technology. For more information on RF Monolithics, Inc., please visit the Company’s website at http://www.RFM.com or follow us on twitter @wireless_is_RFM.

Forward-Looking Statements

This news release contains forward-looking statements, made pursuant to the Safe Harbor Provision of the Private Securities Litigation Reform Act of 1995, that involve risks and uncertainties. Statements of the plans, objectives, expectations and intentions of RFM and/or its wholly-owned subsidiaries (collectively, the “Company” or “we”) involve risks and uncertainties. Statements containing terms such as “believe”, “expect”, “plan”, “anticipate”, “may” or similar terms are considered to contain uncertainty and are forward-looking statements. Such statements are based on information available to management as of the time of such statements and relate to, among other things, expectations of the business environment in which we operate, projections of future performance, perceived opportunities in the market and statements regarding our mission and vision, future financial and operating results. Such statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions, including risks related to economic conditions as related to our customer base, collection of receivables from customers who may be affected by economic conditions, maintaining favorable terms of sales with customers and suppliers, the highly competitive market in which we operate, rapid changes in technologies that may displace products sold by us, declining prices of products, our reliance on distributors, delays in product development efforts, uncertainty in customer acceptance of our products, changes in our level of sales or profitability, manufacturing and sourcing risks, availability and lead times of raw materials, cost of components for our products, product defects and returns, as well as the other risks detailed from time to time in our SEC reports, including the report on Form 10-K for the year ended August 31, 2009. We do not assume any obligation to update any information contained in this release.