The ABU4 (UM-4) from Abracon LLC is a RF Quartz Crystal with Frequency 10 to 200 MHz, Frequency Stability ±3 ppm, ±5 ppm, ±10 ppm, ±15 ppm, ±20 ppm, ±25 ppm, ±30 ppm, ±35 ppm, ±50 ppm, Frequency Tolerance ±10 ppm, ±15 ppm, ±20 ppm, ±25 ppm, ±30 ppm, ± 50 ppm, Drive Power Level 1 mW, 100 uW, Load Capacitance 18 pF. Tags: Thru Hole. More details for ABU4 (UM-4) can be seen below.