Electronic timing system, SMT Tuning Fork Crystal, crystal oscillator circuit,

 ABM3C Series 12 MHz ±30 ppm 18 pF -40 to +85 °C Surface Mount Ceramic Crystal

https://www.futureelectronics.com/p/electromechanical--timing-devices--crystals/abm3c-12-000mhz-d4y-t-abracon-5024206