The 221 Series from Oscilent is a RF Quartz Crystal with Frequency 25 to 300 kHz, Frequency Tolerance ±5 to 100 ppm, Drive Power Level 1 µW, Load Capacitance 6 to 12.5 pF, Shunt Capacitance 0.85 to 2 pF. Tags: Surface Mount. More details for 221 Series can be seen below.