Radio Crystal works in wireless/handheld applications.
Press Release Summary:

Original Press Release:
New Fox Mini-Crystal Is Smallest Available For Wireless And Handheld Applications
Fort Myers, FL, December 2001 - Fox Electronics, America's leading supplier of frequency control products, now offers the FX325B, the smallest crystal available for wireless, portable, handheld and other applications where size and weight are critical. Measuring just 3.2 mm x 2.5 mm x 0.8 mm, the FX325B is 60% smaller than the next smallest crystal on the market.
Typical devices that will benefit from this new miniature crystal include Bluetooth, PCMCIA Cards, PDAs, Laptops, and a variety of other portable and handheld devices. The new Fox crystal offers a frequency range of 20 MHz to 50 MHz; a frequency tolerance of ±50 PPM; a frequency stability of ±50 PPM; and an operating temperature range of -10°C to +60°C. Other tolerances, stabilities and operating temperature ranges are available.
FX325B crystals are available in bulk quantities or on a 3,000-unit tape and reel for automatic assembly systems.
Pricing for a 20 MHz FX325B crystal begins at $1.46 in quantities of 3,000. Delivery is 8 to 10 weeks ARO.