1,Built-in high-capacity lithium- battery for mobile and outdoor use. 2,Shutdown automatically saves the setting parameters without manual intervention. After the power-on, the interface are exactly the same as the shutdown, and the use is worry-free. 3,Can be used to test the antenna, the impedance of the radio frequency devices. 4,The instrument has four interfaces: single point measurement, function, system information and calibration. The default power-on interface is single point measurement. 5. Aluminum alloy shell, extending service life. Operating frequency: 137.5MHz~2700MHz Step frequency: 1kHz Display: 2.4 inch TFT, resolution 320 * 240 (QVGA) Power consumption 1.5W Charging current: 400mA Charging interface: USB Auto Power Off: 5~60 minutes can be set Measuring parameters: impedance, reactance, SWR and S11 Resolution: 4-digit Frequency accuracy: 10ppm Connector: SMA-K Impedance measurement range: 1ohm~ 1000ohm@frequency Less than 1300 mhz; 1 ohm~300 ohm @ frequency 1300MHz (absolute value of impedance) Measuring range of standing wave: 1 ~ 65 @frequency Less than 1300 mhz; 1~10 @ frequency at 1300 mhz S11 (dB) Measurement range: 0dB to - 50db Error (single point measurement): Impedance:Less than Impedance absolute value x 5% 0.1 ohm (Z Less than 200 ohm,Less than 1.5GHz) Standing wave: Less than effective x 10% 0.1 S11: 0.1dB/5(0dB to -10dB) For (dB/):1dB/10(-10dB to -20dB); 5dB/20 (- 20dB to - 40dB) Directionality:Less than 35dB (140MHz to 2GHz after correction)& ; 30dB (2GHz to 2.7GHz) Number of scanning points: 280 Output level: - 18dbm Operating temperature: 0 ~40 Atmospheric pressure: 860hPa~1060hPa Colour:black Material:Aluminum alloy Package Contents: 1 x antenna analyzer 1 x USB cable 3 x calibrators