Quartz crystal resonators can be divided into HC-49U, HC-49U / s, HC-49U / s · SMD, UM-1, UM-5 and columnar crystals according to their different external structures.

HC-49U is suitable for electronic products with wide space, such as communication equipment, television, telephone and electronic toys.

HC-49U / S is applicable to all kinds of thin and small electronic equipment and products with limited space height. HC-49U / s · SMD is a quasi surface mount product, which is suitable for all kinds of ultra-thin, small computers and electronic equipment.

Columnar quartz crystal resonator is suitable for frequency stabilization and timing electronic products with narrow space, such as timers, electronic clocks, calculators, etc. Um series products are mainly used in mobile communication products, such as BP machines, mobile phones, etc.