Fox Electronics is a supplier of the industry's largest range of frequency control products, including quartz crystals, temperature controlled and voltage controlled crystal oscillators (TCXOs and VCXOs ), clock oscillators, and monolithic crystal filters, OCXOs and the new XpressO XOs.

Fox frequency control products are currently used worldwide in applications ranging from wireless communications equipment and microprocessors, computers and their peripherals in telecommunications devices, clocks, watches, timing devices, instrumentation both fixed and portable.