Specifications: Dimensions: 5.25" x 3" x 1.25" Weight: 6.5 oz Color: Black Reacting Time: 0.4S Power supply: One 9V Battery(s) (Not included) Features: and . Easy operation, can detect the power of Electromagnetic Radiation around home, warehouse, office and so on. Screen: LCD display with Data Hold. Wide Frequency range: 50Hz-2000MHz. Can measure radiation of cell phones if they are charging. How to use: 1. Turn on the device 2. Close to the subject slowly until contact with it. The radiation number will go up when the detector is geting closer. (Note: Don't use for high voltage subject.) 3. Change the angle during detecting until get the maximum data. ( The reading will be "0" if the subject is power off.) Package includes: 1pc of Radiation Detector 1pc of User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin