Frequency control devices, What are Crystal Systems, ceramic resonator filter

 RSM200S Series 32.768 kHz ±20 ppm 12.5 pF -10 to +60 °C SMT Tuning Fork Crystal

https://www.futureelectronics.com/p/electromechanical--timing-devices--crystals/rsm200s-32-768-12-5-tr-raltron-1457787