Feature:1. DYNAMIC DISPLAY: Digital power SWR meter has 5 interface display modes and dynamic analog display bar2. EFFICIENT SWITCHING: The shortwave power SWR meter switch between normal mode and peak hold mode. High speed average detection mode, bring real time efficiency display3. HIGH ACCURACY: According to the detection diode characteristic fitting algorithm, the accuracy of the standing wave meter is better than 5%4. ALARM AND BATTERY: Intermittent buzzer alarm with standing wave greater than 2.0, continuous buzzer alarm with standing wave greater than 3.0. Built in lithium battery, can be used for more than 50 hours at a time5. COMPATIBLE CODE: HF power SWR meter is compatible with for g8gyw open source software code, free code modification bring more funSpecification:Item Type: Power SWR MeterFrequency Range: 1.6-50MHzPower Measurement Range: 0.5W-150WStanding Wave Measurement Range: 1.0-99.9Insertion Loss: <0.12dBInserted Standing Wave: 1.6-30MHz1.02; 30-50MHZ1.05Measurement Accuracy: Better than 5%Impedance: 50Standing Wave Alarm: 2.0 intermittent alarm, 3.0 continuous alarm (with shutdown function)RF Interface Type: SL16-MDisplay Content: Forward power; Standing wave; Antenna power; EfficiencyPower Supply: Built in rechargeable lithium battery or USB Type CBattery Type: 1 x 3.7V rechargeable lithium battery 900mAhShutdown Power Consumption: <0.1uAScreen Size: 0.96inScreen Type: Organic Light Emitting DiodeData Communication: USB Type CDimension: Approx. 88 x 38 x 64mm / 3.46 x 1.5 x 2.52in(excluding protruding parts).Package List:1 x Power SWR MeterNote:More than 500W May damage the detection component.