Features: 120W digital power standing wave meter Direct reading of multiple parameters of forward and reverse power standing wave 240 x 240 full color HD display High standing wave alarm function Delayed shutdown function, transmitting automatic startup function, and battery undervoltage protection function. LED dual indication function Power fine-tuning function, standing wave fine-tuning function. One button switching function of Chinese and English menus Buzzer one key on/off function One button switching function of multiple display interfaces Customized standing wave alarm setting function Customized shutdown delay time setting function Specifications: Operating frequency: 1.8-50Mhz Measuring range: 0.5-120W (SSB mode can reach 200w at most, and the buzzer will alarm when it exceeds 200w) Standing wave range: 1-99.9 (the default alarm is 2.0, and the alarm point can be manually set through the hidden function) Charging interface: Type_ c 5v/1A Battery model: 3.7v/1000mAh (when the battery voltage is lower than 3.4v, the buzzer will ring for charging, and it will automatically shut down when the battery voltage is lower than 3.35v) Interface type: UHF (SL16) Shell size: 88mm x 63mm x 38mm (excluding protruding parts) Colour: Black Material: aluminum alloy Package Contents: 1 x SWR Meter 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.