Description: Model: 32.768 KHZ (3 * 8) Species: Crystals Size: 2*6 mm Nominal frequency: 32.768 KHZ (MHz) Adjust the frequency offset: + - 20 PPM (MHz) Temperature frequency offset: + - 20 PPM (MHz) The total frequency offset: 0-20 PPM (MHz) The load capacitance: 12.5 (pF) Load resonant resistance: 30 k (&;) Drive level: 20 (mW) Reference temperature: - 40-80 (℃) Insertion loss: 20 (dB) Stop-band attenuation:20 (dB) The input impedance:30 &; (k) Output impedance: 30 &; (k)   Function: Crystals are widely used in network communication products 32768 / computer/communications products/digital products such as electronic watches and clocks, Called the crystals crystal oscillator, is a kind of electromechanical device, as long as give crystals electricity, it will generate mechanical oscillation, and if the mechanical force to it, it will generate electricity. Crystals in application specific role, the microcontroller clock source can be divided into two categories: the clock source, based on the mechanical resonance devices such as crystals, ceramic resonant tank circuit;RC oscillator (resistor, capacitor).One is Pierce oscillator configuration, apply for vibration and ceramic resonant tank circuit.Another for simple division of RC oscillator. Crystals in various construction machinery has a very important role.With the development of electronic machinery, people more and more research on crystals, and the development trend of crystals also more and more widely. Main items: Don't knock, distortion, pressure, afraid of hot, don't use soldering iron welding shell.Don't ultrasonic cleaning.Otherwise will work is not stable   Package includes: 20 x crystal vibration