Feature: Output frequency range 138MHz-4.4GHz, Stepping: 1kHz Output power (for reference): 150M-3.2DBM; 250M-3.4DBM, 500M,-3.4DBM; 750M-2.8DBM, 1000M-3.4DBM; 1500M-3.6DBM; 2000M-4.0DBM; 2500M-2.8DBM; 3000M-1.8DBM; 3500M-3.6DBM Spectrum of the input frequency range of 138M-4.4GHz Frequency Accuracy (after calibration): +-1k @ 1GHz Low-noise input signal amplitude:-80DBM @ 0.5G Power: USB2.0, USB3.0 (+5 V/0.3A, it is best to pick USB3.0) Interface: USB2.0/ USB3.0, SMA Recommended tracking source (purchased separately) on our ebay shop.Item include 138M-4.4G signal source signal generator/simple spectrum × 1 USB cable × 1 SMA cable × 2