Item Type: Standing Wave Meter Material: Aluminum Alloy Color: Black Battery: Built-in Polymer Lithium-ion Battery 503450 (1000mAh) Charging Interface: Type-C Frequency Range: 1.8MHz-50MHz (with reference value for V-band) Power Range: 0.5W-120W (up to 200W, long-term testing under 120W recommended for FM, AM, CW modes; SSB mode optional) Measurement Accuracy: <±5% VSWR Range: 1.0-99.99 Access Interface: SO239 Features: 1. No Power Supply Needed: DIY digital power standing wave meter, compact and portable, with a built-in rechargeable battery. 2. Digital Display: Directly displays forward power, reflected power, antenna power, antenna efficiency, standing wave ratio, and battery voltage. 3. High Accuracy: Meets amateur needs with high standing wave accuracy and a battery voltage warning function. 4. Power Range: 0.5W-120W (up to 200W, long-term testing under 120W recommended for FM, AM, CW modes; SSB mode optional), with one-button operation and mode switching. 5. Indicator Lights: Red light indicates charging, green light indicates full charge, and yellow light indicates undervoltage. 1 x Standing Wave Meter VSWR Indicator Lights: Green: VSWR < 1.5 Yellow: 1.5 ≤ VSWR < 2.5 Red: VSWR > 2.5 Audible Alerts: Intermittent alarm for 2.5 < VSWR < 3 Continuous alarm for VSWR > 3 Continuous prompt and yellow indicator for low battery voltage. The buzzer can be turned off with a button.