The 279 Series from Oscilent is a RF Quartz Crystal with Frequency 12 to 32 MHz, Frequency Tolerance ±10 to ±30 ppm, Drive Power Level 10 to 300 µW, Load Capacitance 8 to 12 pF, Shunt Capacitance 3 pF. Tags: Surface Mount. More details for 279 Series can be seen below.