The HC-49/4H-SD from Connor-Winfield is a RF Quartz Crystal with Frequency 3.2 to 25.31222 MHz / 27 to 70 MHz, Frequency Stability ±50 ppm, Frequency Tolerance ±30 ppm, Drive Power Level 0.1 mW, Load Capacitance 16 pF. Tags: Surface Mount. More details for HC-49/4H-SD can be seen below.