The VCO5558 from Dynamic Engineers is a Voltage Controlled Oscillator with Frequency 5.5 to 5.815 GHz, Power 1 mW, Tuning Sensitivity 100 MHz/V, Tuning Voltage 0.5 to 4.5 V, Pulling 5 MHz/V. Tags: Surface Mount. More details for VCO5558 can be seen below.