Features 1、Easy to Read: Intuitive 5 colored LED Display let you easily and clearly read in day and darkness,reports EMF measurements in the range of 0-20+ milliGauss. 2、Ergonomic Design And Effortless Hold: Our EMF detector is in portable size, space saving when storing,and easy to carry when outing. 3、Easy to Use：One button to turn on/off without hesitation. This product is powered by a 9V battery(not included). 4、Larger Frequency Range: This EMF reader for radiation measures various electromagnetic fields from 30 Hz to 20,000 Hz. 5、Wide Application: The handheld design is convenient for use in homes, offices, outdoors, and industrial places. It/u0027s also easy to detect radiation such as mobile phones, computers, TVs, refrigerators or high-voltage line. Specification This instrument uses LEDs to display the intensity of electromagnetic radiation in the measured environment. The handheld design is convenient for use in homes, offices, outdoors, and industrial places. It's also easy to detect radiation such as mobile phones, computers, TVs, refrigerators or high-voltage line. Features: Easy to Read: Intuitive 5 colored LED Display let you easily and clearly read in day and darkness,reports EMF measurements in the range of 0-20+ milliGauss. Ergonomic Design And Effortless Hold: Our EMF detector is in portable size, space saving when storing,and easy to carry when outing. Easy to Use：One button to turn on/off without hesitation. This product is powered by a 9V battery(not included). Larger Frequency Range: This EMF reader for radiation measures various electromagnetic fields from 30 Hz to 20,000 Hz. Wide Application: The handheld design is convenient for use in homes, offices, outdoors, and industrial places. It's also easy to detect radiation such as mobile phones, computers, TVs, refrigerators or high-voltage line. Specifications: Model: FY8817 Color: Black Detection Frequency: 30-20000 Hz Detection Range: 0-20 + milliGauss Accuracy : ±5% Battery : 1 x 9V batteries required(not included) Alarm Mode: LED alarm light Altitude: 1800 meters Pollution Level: Level 2 Working Temperature and Humidity: 45%~80%RH at 0~40℃ / 32~104℉ Storage Temperature and Humidity: 45%~80%RH at -10~50℃/-4~140℉ Material: ABS Item Size:16 * 5.5 * 3 cm / 6.3 * 2.16 * 1.18 inch Item Weight: 93g / 3.28oz Package Size: 20 * 9.5 * 5 cm / 7.87 * 3.74 * 1.97 inch Package Weight: 180g / 6.35oz Package List: 1 * Electromagnetic Radiation Meter 1 * User Manual (English) Package List 1 * Electromagnetic Radiation Meter 1 * User Manual (English)