Equipment set You will get 1 electromagnetic field meter and 2 motion activated balls such a great combination can easily meet your needs and add more ecitement and funAccurate Measurement Builtin electromagnetic radiation detector, processed by the controller, can display the radiation value on the clear LCD digital display Measure magnetic field radiation in MGT and electric field in voltsmeter Note This EMF meter cannot test RF valuesMultifunctional The electromotive force detector has multiple functions, including data retention, maimum measurement, single touch lock data, manual or automatic shutdown, safety value setting, sound and light alarm, etc.Sound and light alarm When the electromotive force reader test result eceeds the set value 0.4T or 40V, the indicator light flashes, the screen turns red, and the buzzer alarms if you test in some quiet areas, you can turn off the buzzer first device so as not to disturb other areasWide range of applications This ghost detector device is small and portable and can be operated with one hand. It is suitable for radiation testing of microwave ovens, rice cookers, refrigerators, mobile phone towers, printers, etc., helping to reduce the risks of radiation damage to your familys health, perfect for paranormal investigations and hotel inspectionsPower supply AAA 1.5V 3pcs batteries not includedColor BlackMaterial PlasticPackage contents1 Emf meter2 Light ballOnly the above package contents, other products are not included.Note Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is 13 cm.