Features Working Parameters: Digital power standing meter, operating frequency is 1.8‑54Mhz, measurement range is 0.5‑200W, standing range is 1‑99.9, default standing greater than 2.0 will alarm. Power and Standing Ratio: This SWR meter supports forward and reverse, power and standing ratio parameter reading, supports power and standing fine tuning functions (±20%). Alarm Function: Supports high standing alarm function (standing alarm point can be set), supports delayed shutdown function (shutdown time can be set), convenient and practical. Multiple Functions: The digital power standing ratio meter supports automatic startup function, battery undervoltage guard function, and analog progress bar function, safe and reliable. Built in Battery: This power SWR meter has built in 3.7V rechargeable lithium battery, 4000mAh large capacity to ensure long endurance, with low voltage alarm and automatic shutdown functions. Specification: Item Type: SWR Power Meter Working Frequency: 1.8-54Mhz Measurement Range: 0.5-200W (Recommend not to exceed 120W in FM, CW, AM, FT8 modes) SWR Range: 1-99.9 (Default alarm when SWR is greater than 2.0, alarm point can be set through menu) Charging Interface: Type C DC5V 1A (Charging voltage maximum 5.5V) Battery Type: 1 x 3.7V Rechargeable Lithium Battery 4000mAh (built in) (Battery voltage lower than 3.4V will flash alarm, lower than 3.35V will power off automatically) Connector Type: UHF(SL16) Package List: 1 x SWR Power Meter Package List 1 x SWR Power Meter