Product description: Color: Black Material: ABS Accuracy: +/- 5% Battery: 1 x 9V batteries Detection Range: 0 to 20+ milliGauss Detection Frequency: 30 - 20,000 Hz Features: *Easy-to-read multi-segment LED display. *The EMF Meter Range for Ghost Hunting helps measure the electromagnetic fields to identify appliances that produce high-level emissions, allowing users to make informed decisions about limiting exposure. *Measure wide spectrum of EMFs from 50 Hz up to 20,000 Hz, and it can register a cell phone that is within 2 feet. *Convenient push-on/push-off operation; Portable, easy to use, rugged, reliable, super responsive with easy to read LED light scale in dark and sunshine. The Five Scales: （1）The 1st Light detects a Normal EMF field, what is always around us.The range is between 0 to 1.5 mG （2）The 2nd Light (GREEN) detects a Low Level EMF,which range is between 1.5 to 2.5 mG. （3）The 3rd Light (YELLOW) detects a Mid Level EMF in the range between 2.5 to 10 mG. （4）The 4th Light (ORANGE) detects a High Level EMF field in the range between 10 to 20 mG （5）The 5th Light (RED) detects an Extremely High EMF Range of 20+ mG Package Included: 4* EMF Magnetic Field Detector (Battery is included)