Features: 1. Compact product 2. One click lock radiation for easy movement with one hand 3. Measurement of broadband electromagnetic fields from 50Hz to 20000 Hzan 4.5 color LED indicators, representing different radiation values; Easy to use 5. Product use: computer, hair dryer, microwave oven, refrigerator, notebook computer 6. Keeping you away from radiation is good for your health Parameters: Available colors: Black+Black sticker, Black+Red sticker, Red+Black sticker, Red+Red sticker Material: ABS Frequency monitoring: 50/60Hz Detection range: 0-20 milliGauss Light indication: Dark green light: 0 1.5 milliGauss Green light: 1.5 to 2.5 milliGauss Yellow light: 2.5 to 10 milliGauss Orange light: 10 to 20 milliGauss Red light: 20+milliGauss Note: The product is used to measure electric fields and does not detect nuclear radiation. Package include: Carton packaging Electromagnetic radiation tester * 1+instructions * 1