Feature 1[Accurate Measurement] This electromagnetic field radiation detector adopts advanced technology, providing high sensitivity and accuracy, can accurately measure a wide spectrum of EMFs ranging from 50Hz to 20,000Hz. 2[LED Indicator] The LED indicator helps you easily understand the electromagnetic field, which turns dark green for 1 to 2.5mG, green for 2.5 to 5mG, yellow for 5 to 10mG, orange for 10 to 20mG, and red for 20+mG. 3[Battery Powered]: This portable EMF detector is powered by a 9V 6F22 battery, making it convenient to use. Made with ABS material, sturdy and resistant to impact. 4[Easy to Use] With just one button, this electromagnetic field radiation tester is easy to operate with one hand, compact and lightweight, allowing for easy pocket storage and carrying. 5[Wide Application] Widely used in ghost hunting and measuring electromagnetic fields, this detector helps identify devices with high radiation and assists users in making decisions to limit exposure.Item Type: Electromagnetic Field Radiation DetectorMaterial: ABSModel: ER10BBMeasurement Range: 0-20+mGPower Supply: 9V 6F22 dry battery x 1 (shipped without battery)Accuracy: 5%Size: Approx. 150x55x30mm/5.9x2.2x1.2inMeasurement Frequency: 50 60HzWorking Temperature: 18-49 (0-120) .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Electromagnetic Field Radiation Detector1 x User Manual