1 - Easy to observe - The supernatural device has 5 colored LED lights for distinguishing different frequencies, which is very convenient to use both day and night 2 - Easy to carry - Small and flexible Ghost Hunter device that will not feel uncomfortable in your pocket, size and weight - 5.75" (L) x 2.25" (W) x 1" (H); 6 oz 3 - OPERATION - Hold the EMF meter on the switch with your thumb, point it at the EMF source, and press and hold the switch (a brief blink of the LED will appear) and the LED will indicate the EMF range for that level 4 - Ghost Hunting - This paranormal device can detect the strength of magnetic fields at home, in life and at work, and is an essential tool for paranormal enthusiasts 5 - Detection Range - EMF meters can detect magnetic field strengths from 50 Hz to 20,000 Hz with an error of less than 5%