According to the detection diode characteristic fitting algorithm and dual reference segmented detection, the accuracy is 5% in the entire power range of 0.5w-150w Five interface display modes, one-click selection according to preference High-speed average detection mode, real-time display of efficiency, buzzer alarm when standing wave is 2.0. Compatible with open source software code, free code modification brings more fun, USB firmware upgrade does not require a dedicated burner Multi-function buttons increase the fun of use and provide an interactive way to add functions in Frequency range: 1.6-50mhz Power measurement range: 0.5w-150w Standing wave measurement range: 1.0-99.9 Insertion loss: Less than 0.12db Insertion standing wave: less than equal 1.02 Measurement accuracy: ± 5 Standing wave alarm: equal 2.0 (with shutdown function) interface type: sl16-m or n (default is 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 Power off power consumption: Less than 0.1ua Data communication: USB Type-C Firmware upgrade: support Note: In FM or am mode, the continuous transmission power is recommended to be no more than 110W; SSB or CW can work for a long time at 200W; exceeding 500W damage the detection components Colour:Black Material:Metal Package Contents: 1 x SWR Power Meter 1 x USB Cable 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.