The UM-4 from ECS Inc. International is a RF Quartz Crystal with Frequency 30 to 90 MHz, Frequency Stability ±10 ppm, Frequency Tolerance ±10 ppm, ±15 ppm, Drive Power Level 500 µW, Load Capacitance 10 pF. Tags: Thru Hole. More details for UM-4 can be seen below.