("Tfx 02s 32768kj21058")TFX-02S-32.768KJ21058 with SMD Crystal Resonators SMD-3215-2P RoHS, manufactured by RIVER, is an electronic part consisting of an oscillator system that is commonly used as a timekeeping element in computers and other electronic systems. It consists of a small quartz crystal resonator that has been mounted onto a printed circuit board using a surface mount technology (SMD) process. The resonator is encapsulated in a RoHS (Restriction of Hazardous Substances) compliant housing to protect it from dust, moisture and other environmental elements. It has a frequency of 32.768 kHz and can handle a frequency tolerance of ±20 ppm. This crystal oscillator can be used to generate an accurate reference frequency for computers and other digital systems.