1. MAIN PURPOSE: The vector impedance analyzer is mainly used to test antenna impedance, RF device impedance, circuit board impedance, etc. 2. MEASURING PARAMETER: Can be used to measure resistance, reactance, standing , and S11, with a wide measurement range, high resolution, and accuracy. 3. BUILT IN BATTERY: The antenna analyzer has built in 2000mAH lithium battery, USB interface for charging, can operate continuously for over 4 hours. 4. OTHER FUNCTIONS: The single point measurement result is 4 digit significant figures, 280 scanning points, with calibration function, stable and reliable. 5. 2.4IN TFT SCREEN: The antenna impedance analyzer adopts 2.4 inch TFT screen, and portable, suitable for outdoor and high altitude work. Working Frequency: 137.5MHz-2700MHz Frequency Step: 1kHz Display: 2.4 Inch TFT Resolution 320x240 (QVGA) Battery: 2000mAH Lithium Battery (built in battery) Power Consumption: Charging Current: 400mA Charging Interface: USB (only used as a charging interface) Automatic Shutdown: Settable (continuously on, 5-60 minutes optional) Measurement Parameters: Resistance, Reactance, Standing , S11 Resolution: 4 Significant Value Frequency Accuracy: Connector: SMA-K Measurement Range: Impedance: Frequency 1300MHz (absolute impedance value) Standing : Frequency 1300MHz S11: 0dB to -50dB Error (Single Point Measurement): Impedance: Z 1.3GHz S11: 0dB to -10dB, -10dB to -20dB, -20dB to -40dB Standing : Directionality (After Calibration): 137.5MHz, 34.375MHz -2GHz, 2GHz -2.7GHz Scan Points: 280 Output Level: -18dBm Working Temperature: 5-40 Atmospheric Pressure: 860hPa-1060hPa How to Use:Power On: Hold down the CTRL key and press the OK key to power on.Power Off: Long press ( 2S) OK key to power off. Colour:Black Material:plastic+Metal Package Contents: 1 x Antenna Analyzer 1 x USB Cable 1 x English User Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.