SWR Meter 1.6‑50MHz 0.5W‑200W 1.29in Screen Shortwave HF PWR Power Tester Tool with Alarm Item Type: SWR Meter Frequency Range: 1.6-50MHz Power Measurement Range: 0.5W-200W Standing Wave Measurement Range: 1.0-99.9 Insertion Loss: <0.12dB Standing Wave Insertion: ≤ 1.02 at 1.6-30MHz. ≤ 1.05 at 30-50MHz. Measurement Accuracy: Better than ± 5% Impedance: 50 Ω Standing Wave Alarm: When the standing wave is ≥ 2.0, an intermittent beep alarm will be enabled. When the standing wave is ≥ 3.0, a continuous beep alarm will be triggered. The alarm clock can be turned off. RF Interface Type: so239 Display Content: Forward power, standing wave, antenna end power, efficiency. Power Supply: Built in rechargeable lithium battery or USB type c. Battery Type: 1 x 3.7V rechargeable lithium battery, 900mAh. Shipped with built in battery. Power Consumption: <0.1uA Screen Size: 1.29in Screen Type: Organic Light Emitting Diode Data Communication: USB Type C Firmware Upgrade: Supporting Product Dimension: Approx. 88 x 38 x 64mm / 3.46 x 1.5 x 2.52in, excluding protrusions.