The VCO1212W-4000-6000-A from Dynamic Engineers is a Voltage Controlled Oscillator with Frequency 4 to 6 GHz, Power 4 mW, Tuning Sensitivity 200 to 350 MHz/V, Tuning Voltage 0 to 16 V, Pulling 30 to 50 MHz. Tags: Surface Mount. More details for VCO1212W-4000-6000-A can be seen below.