The RS1800AH from Roswin is a Voltage Controlled Oscillator with Frequency 1700 to 1900 MHz, Power 1.995 mW, Tuning Sensitivity 66 MHz/V, Tuning Voltage 0.5 to 4.5 Vdc, Phase Noise -105 dBc/Hz. Tags: Surface Mount. More details for RS1800AH can be seen below.