Fox Electronics' broad range of crystals, oscillators, TCXOs, VCXOs, OCXOs, and filters are used worldwide, in applications ranging from wireless communications equipment and telecommunications devices, to computers and their peripherals, to instrumentation and all the way to out-of-this-world aerospace uses frequency control device, microprocessor crystal, piezo electric device, real time clock, resonant circuit, temperature compensated, voltage compensated, ECL, HCMOS, PECL, TTL.http://www.foxonline.com/crystals_4x25.htm »