Item Type: Digital Power Standing Wave MeterMaterial: Aluminum AlloySize: Approx. 88x63x38mm / 3.46x2.48x1.50inBattery: Polymer Lithium Ion Battery (Built In) Capacity: 1000 mAh (Battery Voltage Below 3.4V Buzzer Beep to Prompt Charging, Below 3.35V Automatic Shutdown)Operating Frequency: 1.8-54MhzMeasurement Range: 0.5-120W (SSB Mode Up to 200W, over 200W Buzzer Alarm)Standing Wave Range: 1-99.9 (default Greater Than 2.0 Alarm, You Can Manually Set the Alarm Point)Charging Interface: Type C 5V 1AInterface Type: UHF (SL16)Package List1 x Digital Power Standing Wave Meter Please allow some error in manual measurement.1Full Color LCD Display: Standing wave meter has 240240 full color LCD display, which can directly display forward power, reflected power, antenna power, antenna efficiency, standing wave and battery voltage to accurately meet the needs of amateurs. 2Safety Protection: Short wave power standing wave meter has high level wave alarm function, delayed power off function, automatic power on function when transmitting, battery undervoltage protection function. 3Multifunction: Digital standing wave meter has LED light double indication function, power supply fine adjustment function, standing wave fine adjustment function, Chinese and English menu or multiple display interface one key switch function. 4Buzzer Alarm, Parameter Direct Reading: 0.5120W digital power standing wave meter, SSB mode up to 200W, over 200W buzzer alarm, with forward and reflected power standing wave and multi parameter direct reading function. 51000mAh Large Battery: Short wave power standing wave meter has 1000mAh built in large battery, battery voltage below 3.4V buzzer beeping prompting charging, below 3.35V automatic shutdown. 6Standing Wave Alarm Setting Function: Digital standing wave meter has a custom standing wave alarm setting function, the standing wave range is 199.9, the default alarm is greater than 2.0, you can manually set the alarm point).