The DCSR4000-8 from Synergy Microwave Corporation is a Voltage Controlled Oscillator with Frequency 4 GHz, Power 2.818 mW, Tuning Sensitivity 6 MHz/V, Tuning Voltage 0.5 to 8 V, Pulling 5 MHz. Tags: Surface Mount. More details for DCSR4000-8 can be seen below.