1. Accurate and Efficient: The fitting algorithm of power standing wave meter based on the characteristics of the detection diode, combined with dual- segmentation detection, produces accurate results with an accuracy 5% over the entire power range from 0.5W to 150W. The high-speed averaging detection allows for real-time efficiency display. 2. Multiple Display : With five different interface display , users can select their preferred display option with a single click. This feature of power swr meter provides greater customization and personalization to the user experience. 3. Audible Alert: The short wave standing wave meter exceeding 2.0 triggers a beep alarm, alerting users to potential issues. 4. Compatibility with Open-Source Software: The GM328A supports G8GYW open-source software code, allowing for freedom in modifying the code and adding additional features. The USB firmware upgrade eliminates the need for a special burner, providing easy and convenient upgrades. 5. Long Battery Life and Multi-Functional Keypad: The high frequency swr meter built-in lithium battery provides more than 50 hours of use per charge. The multi-functional keypad provides an interactive way to add functionality and make the user experience even more fun.Insertion loss:Less than 0.12dB. Insert standing wave:1.6-30MHz less than equal 1.02; 30-50MHz less than equal 1.05 :ELECTRICAL Model Number:Display Power Standing Wave Meter Frequency range:1.6-50MHz Power measurement range:0.5W-150W Standing wave measurement range:1.0-99.9 Measurement accuracy: ±5% Impedance:50ohm Standing wave alarm: equal 2.0 (with shutdown function) RF interface type:SL16-M or N (default M) Display content:forward power;standing wave; antenna end power; efficiency Power supply:built-in 3.7V/1000mAh rechargeable lithium battery or USB type-c Shutdown power consumption:Less than 0.1uA Screen size:0.96 inches Screen type:OLED Data communication:USB type-c Firmware upgrade:support Special reminder:It is recommended not to exceed 110W for continuous transmission in FM or AM mode; SSB or CW can work under 200W power for a long time; exceeding 500W will damage the detection components Instructions for use: Long press to switch the machine, short press to switch the display interface, double click to switch the standing wave alarm; There are a total of 5 display interfaces, which are automatically saved and automatically recalled at startup. Charging red light display, fully light off Colour:Black Material:Aluminum alloy Size:Machine size:88mmx64mmx38mm/3.46x2.51x1.49inch (excluding the protruding part) Package Contents: 1 * 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.