Equipment set: You will get 1 electromagnetic field meter and 2 motion activated balls; such a good combination can easily meet your needs and add more excitement and fun Accurate measurement: Built-in electromagnetic radiation detector, processed by the controller, can display the radiation value on the clear LCD digital display; Measure magnetic field radiation (in MG/T) and electric field (in volts/meter); Note: This EMF meter cannot test RF values Multifunctional: The electromotive force detector has multiple functions, including data retention, maximum 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 exceeds 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 to avoid disturbing other areas Wide 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 masts, printers, etc., which helps reduce the risks of radiation damage to your family's health, perfect for paranormal investigations and hotel inspections Power supply: AAA 1.5V x 3pcs (batteries not included) Color: Black Material: Plastic Package Contents: 1 x Emf Meter 2 x Light Ball The above package content only, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3 cm.