Use: Ghost hunting equipment can detect the electrical radiation generated by appliances in daily life such as fans, air conditioners, computers, mobile phones. 5 kinds of LED lights: EMF detector has 5 kinds of LED lights, whether you are in the day or night, you can clearly see the strength of electrical radiation. Rechargeable use: When the LED light is not bright or dark, you can use the spare USB charger to charge it. Product material: Made of high quality raw materials, long use time. If you have any questions, please login to your Amazon buyer account to leave us a message, we will solve you as soon as possible.