Features Precise SWR Measurements: Designed for amateur ham radio enthusiasts, this compact SWR meter ensures accurate tuning, optimizing antenna performance and transmitter power up to 100W for enhanced communication. No Battery Operation: Harnessing power directly from radio frequency sign als, this user-friendly SWR meter is perfect for on-the-go adjustments without the need for external batteries, offering easy portability. Simple Connectivity: With clear IN (RF input) and OUT (RF output) terminals, this meter connects effortlessly between your radio and antenna, streamlining the setup process to measure SWRs effectively and maintain ideal antenna operation. Intuitive LED Feedback: The integrated LED indicators provide real-time status assessment, swiftly illustrating meter readings from excellent to poor conditions, enabling you to make necessary adjustments swiftly and accurately. Energy-Efficient Design: Requiring as little as 5W to activate the green LED indicator for optimal readings (>1.0 SWR), this power-efficient device prevents energy waste, ensuring a prolonged functional lifespan without compromising performance. Specification: Item Type: Shortwave StandingWave Meter Material: Alloy Steel Performance Parameter: Usage Frequency: 3 to 30MHz Power: 5-100W Insertion Loss: Less than 0.3dB StandingWave: Less than 1.2 Interface: M base packing list: 1 xShortwave StandingWave Meter Package List 1 x Shortwave Standing Wave Meter