Feature: 1. Working Parameters: Digital power standing wave meter, operating frequency is 1.8‑54Mhz, measurement range is 0.5‑200W, standing wave range is 1‑99.9, default standing wave greater than 2.0 will alarm. 2. Power and Standing Wave Ratio: This SWR meter supports forward and reverse, power and standing wave ratio parameter reading, supports power and standing wave fine tuning functions (±20%). 3. Alarm Function: Supports high standing wave alarm function (standing wave alarm point can be set), supports delayed shutdown function (shutdown time can be set), convenient and practical. 4. Multiple Functions: The digital power standing wave ratio meter supports automatic startup function, battery undervoltage guard function, and analog progress bar function, safe and reliable. 5. 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