The CVCO45CL-0421-0441 from Crystek Corporation is a Voltage Controlled Oscillator with Frequency 421 to 441 MHz, Power 1.995 mW, Tuning Sensitivity 15 MHz/V, Tuning Voltage 0.3 to 2.7 V, Pulling 1 to 2 MHz. Tags: Surface Mount. More details for CVCO45CL-0421-0441 can be seen below.