This portable electromagnetic radiation tester with alarm is mainly used for radiation monitoring and radiation-proof protection, it's suitable for both home and industrial use no matter indoors or outdoors. It adopts sensitive sensor and advanced chip, and can measure average or peak values. Rechargeable design allows more convenience for outdoor use. Features: Electromagnetic Radiation Tester -- This handheld portable tester is built in with high sensitivity sensor and advanced chip, it's suitable for detecting radiation of electric and magnetic field at the same time. Dual mode switchable: average/ peak value. LCD Backlight Screen -- Clear LCD digital display with backlight, clear at a glance, easy to read even in dark environments; automatic shutdown in about 5 minutes idle time to save power. With data hold, unit change, electric/ magnetic field zero functions, more humanized to use. Rechargeable Battery, Low Battery Indication -- Built-in rechargeable lithium battery with 600mAh high capacity and low power consumption ensures strong endurance. Easy to charge it via the USB interface. With battery level display to remind users of charging it in time. Easy Operation, Alarm Function -- Compact and lightweight, handheld and portable design, non-slip and comfortable to grasp, easy to use and carry. The screen will also show the result of electromagnetic radiation evaluation. Automatic sound and light warning when reaching the alarm value. Wide Application -- It can be widely used in home, offices, outdoor places, industrial workplaces for the electromagnetic radiation detection of mobile phone, tablet, computer, TV, fridge, microwave oven, printer, electric wire and etc.. It can also be used for testing the protection effect of radiation-proof clothes and protective film. Note: Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: Black & Red Material: ABS Screen: LCD Digital Display, with Backlight Frequency Bandwidth: 5Hz~3500MHz Sampling Time: about 0.4S Operating Environment: 0~50& 8451;, & 65308;80% RH Built-in Battery: 3.7V 600mAh Lithium Battery Item Size: 134 * 61 * 25mm / 5.28 * 2.40 * 0.98in Item Weight: 133g / 4.68oz Package Size: 18 * 9.5 * 3.2cm / 7.09 * 3.74 * 1.26in Package Weight: 180g / 6.35oz Electric Field: Unit: V/m Accuracy: 1V/m Range: 1~1999V/m Alarm Value: 40V/m Magnetic Field: Unit: μT/ mG Accuracy: 0.01μT/ 0.1mG Range: 0.01-99.99μT/ 0.1-999.9mG Alarm Value: 0.4μT/ 4mG Package List: 1 * Electromagnetic Radiation Tester 1 * USB Cable 1 * User Manual (English)