Material: ABS plastic Precision: electric field: 1 V/m; magnetic field: 0.01T Range: electric field: 1-1999V/m; magnetic field: 0.01 uT - 99.99 uT Testing bandwidth: 5Hz-3500MHz Operating temperature: 050/30~122 Operating voltage: 1.5V AAA 1.MAKE LIFE MORE SAFE & COMFORT-You cant see, smell, taste, feel, or hear electromagnetic fields (EMF) but make no mistake they are there. This meter is intuitive and simple to use. Just get closer to the electromagnetic radiation source and test. Tip: for best result, please put close to tested devices. 2.ONE-HANDED OPERATION & HIGH SENSITIVITY- One-handed operation, easy to move for on-site measurements, effectively identify the signal source and locate the signal position; Although EMF Detector is compact and light, it is still high sensitivity. Radiation assessment is equipped with a built-in magnetic radiation sensor to display the radiation value on the digital LCD screen after processing by control micro-chip 3.AUTO SOUND-LIGHT ALARM & ONE TOUCH LOCK RADIATION- EMF Meter is built-in signal strength prompt speaker, and will trigger sound-light alarm when the radiation data exceeds the safe range (Electric field > 40 V/M and Magnetic field> 0.4T)-the detector will flash red and alert the user via an alarm sound automatically; Long press the BEEP can turn off the sound. Data retention to lock Max/Average value by one key.It is a good helper to check out whether the place is radiation-free 4.DUAL READINGS IN LOW OR NO-LIGHT OPERATION- With large clear LCD screen display, two readings could be easily seen even if in dark or sunshine when to turn on the back light function; The EMF Reader screen has visual clarity with large digits and LCD display. Backlight can be easy to turned on and off. Great Tester for Home, School, Office, Outdoor and Ghost Hunting. Measure both magnetic field radiation and electric field radiation at same time clearly and accurately 5.LARGER FREQUENCY RANGE- The measurement frequency range is larger up to 5HZ3500MHz, obtaining more accurate measurement of daily household appliances: TV, mobile phones, computer, refrigerator, induction cooker, electrical wires, etc. It could be also applied to test the effect of anti-radiation clothing, radiation-proof film and other preventive items; Widely used for Research and general EMF detection like electromagnetic radiation monitoring and test