CSR's Open Architecture BlueCore Enables Fast Product Design.

CAMBRIDGE, England -- CSR plc (LSE:CSR):

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CSR plc (LSE:CSR) the world leader in Bluetooth, today announced that its BlueCore technology was selected by Gennum for its nXZEN Bluetooth Noise Cancelling headset. Gennum chose CSR's BlueCore to deliver Bluetooth wireless connectivity for the nXZEN headset, and CSR's extensive interoperability pre-testing ensures connecting to any mobile phone. The nXZEN is v1.2 Bluetooth qualified, offers 100 hours stand by time as well as 7 hours talk time and is shipping worldwide.

Gennum's headset takes advantage of CSR's low power consumption and open architecture, which can support third party external DSPs such as Gennum's World Leading 120 MIPS DSP. Gora Ganguli, Senior Vice President and GM, Audio Wireless Division, Gennum commented, "When it came to choosing a partner, CSR's BlueLab SDK (Software Development Kit) enabled us to quickly implement an interface to our external DSP." Mr Ganguli continued, "The potential user mode enabled by BlueLab meant that we did not have to retest the Bluetooth stack in order to achieve Bluetooth qualification, allowing us to bring the nXZEN to market in time for last Christmas."

CSR offers a range of standard solutions and technologies for customers designing Bluetooth headsets. CSR's BlueLab SDK allows customers to take these standard solutions and customise them enabling differentiation through innovation. Luke D'Arcy, product marketing manager for CSR commented, "The protected user mode enabled by BlueLab means that customer software cannot interfere with the Bluetooth operation of the chips." D'Arcy continued, "This means that very little re-testing is required, which leads to quick time to market."

About CSR

CSR plc is the leading global provider of Bluetooth technology and has developed expertise in other single-chip wireless communication standards such as Wi-Fi (IEEE802.11). CSR offers developed hardware/software solutions for Bluetooth based around BlueCore, a fully integrated 2.4 GHz radio, baseband and microcontroller.

CSR has now launched its fifth generation BlueCore suite and is in volume manufacture of its fourth generation BlueCore devices. BlueCore4 supports the Enhanced Data Rate (EDR) standard, which was ratified at the end of 2004. BlueCore4 remains the only EDR silicon to be shipping in volume today. In November 2004 CSR launched UniFi, the first single chip 802.11a/b/g embedded solution specifically targeting the mobile phone and consumer electronics markets.

BlueCore features in over 50 per cent of all Bluetooth devices shipped and over 60 per cent of all qualified Bluetooth enabled products and modules listed on the Bluetooth website with industry leaders including Nokia, Dell, Panasonic, Sharp, Motorola, IBM, Apple, NEC, Toshiba, RIM and Sony using BlueCore devices in their range of Bluetooth products.

In March 2005, CSR acquired Clarity Technologies Inc., for its Clear Voice Capture (CVC) technology that enhances the audio performance of any voice-based product or system. Applications for CVC include wireless headsets, handsets and automotive hands free systems.

In August 2005, CSR completed the acquisition of UbiNetics' software business, providing a strong R&D team to accelerate its existing software development in Bluetooth, Wi-Fi and UWB. The UbiNetics team gives CSR the capacity to extend its offering to mobile handset customers.

CSR has its headquarters and offices in Cambridge, UK, and offices in Japan, Korea, Taiwan, China, India, France, Denmark, Sweden and both Texas and Detroit in the USA.

More information can be found at www.csr.com and the partner web site www.btdesigner.com

More information about Bluetooth technology can be found on the SIG web site at www.bluetooth.com