The CVCO55CC-3901-4101 from Crystek Corporation is a Voltage Controlled Oscillator with Frequency 3.901 to 4.101 GHz, Power 5.012 mW, Tuning Sensitivity 22 MHz/V, Tuning Voltage 0.1 to 16 V, Pulling 2.5 to 5 MHz. Tags: Surface Mount. More details for CVCO55CC-3901-4101 can be seen below.