Features: Sound and light dual alarm function, it will automatic alarm when the test value over the safety value. Can simultaneous detection of electric and magnetics field radiation for you, allows you to get two important values in one test. Radiation assessment function, which can indicating if current radiation value is at safety level. Three color light indicating the current magnetic field states: safe, alart, avoid, and if the electric field data over the safety state, the screen will become red to alarm you. Can be used for electromagnetic radiation monitoring of House and apartment, office, outdoor and industrial site, electromagnetic radiation test of mobilephone, etc. Specifications: Material: Plastic Size: approx 15.5x7.8x3.5cm/6.1x3.1x1.4in Electric field: V/for m Magnetics field: uT/mG Accuracy: Electric field: 1V/for m Magnetics field: 0.01uT/0.1mG ranges: Electric field: 1-1999V/for m Magnetics field: 0.01-99.99uT/0.1-999.9mG Alarm threhold: Electric field: 40V/for m Magnetics field: 0.4uT/4mG Measurement bandwidth: 5Hz-3500MHz Sampling time: about 0.4s Overload indication: max value of measurement ranges on LCD Operating temperature: 0-50 Operating humidity: relative humidity below 80% Working voltage: 4.5V Battery: 3 x AAA battery (excluded) Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x EMF Meter