Introduction:  After booting, the version information of the device will be displayed, and its power standing wave measurement interface will be displayed after 3 seconds. It also shows you its battery level. English interface is available. And call sign can be customized (need to be notified in advance).   Specifications:  - Frequency range: 1.8MHz-50MHz  - Measurement range: 0.5W-120W (up to 210w. Used below 120w for long-term FM, AM, and CW modes. SSB mode is optional)  - Measurement accuracy: < ±5%  - Standing wave range: 1.0-99.99  - Access interface: SL16 (M socket)  - Charging interface: type-c  - Size of aluminum alloy shell: 63 x 88 x 38mm/2.5 x 3.5 x 1.5" (excluding size of protruding parts)  - Battery capacity: 1000mAh  - Insertion loss: < 0.1db   Indicator Light and Buzzer:  - Red light is on when it is charging. Green light will be on when charging is finished. And yellow light is on when it is working.  - If the standing wave is greater than 2.5, the buzzer will prompt intermittently.  - If the standing wave is greater than 3.0, the buzzer will prompt continuously.  - If the battery is under-voltage, the buzzer will prompt continuously.   Package Included:  - 1 x SWR Power Meter