NOTE：This product is not suitable for children. Description This emf meter is made of stable material, which can withstand use. Features the ABS material, which has high durability, not easy to deform. Very convenient to use. Fine workmanship, practicality. Features -Color:Black -Material:ABS -Size:15.00X5.50X3.00cm/5.89X2.16X1.18in -Power supply: 1 X 9V battery (not included) -There are 5 LEDs, each representing a field strength range as follows: Dark Green - "normal" area - normal background magnetic field. 0 to 1.5 Green - "low" zone - low level magnetic field. 1.5 to 2.5 Yellow - "Warning" area - medium magnetic field. 2.5 to 10 Orange - "high" zone - high magnetic field. 10 to 20 Red - "Warning" zone - extremely high magnetic field. 20+ - The emf detector is widely used, great for testing low-frequency home appliances, computer, EMF tester, microwave oven, etc. - Our magnetic field detector is portable and useful, easy to use, rugged, reliable and responsive. -This emf detector has 5 LED indicator for easy to read, easy to carry all the time due to its compact size. - Our magnetic field detector can be used or wave research and general EMF detection use. - The emf meter is help to measure electromagnetic fields, prevent potentially harmful long-term overexposure to electromagnetic fields. Package list: 1 x meter