The CVCO55CL-0440-0521 from Crystek Corporation is a Voltage Controlled Oscillator with Frequency 440 to 521 MHz, Power 1.995 mW, Tuning Sensitivity 22 to 28 MHz/V, Tuning Voltage 0.3 to 4.7 V, Pulling 0.5 to 1 MHz. Tags: Surface Mount. More details for CVCO55CL-0440-0521 can be seen below.