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.