Bimodule Synchronous Test -- EMF meters can test both radiations in electric field and magnetic field at the same time for precise result.Sound; Light Alarm -- Radiation detectors will assess the test result and it will automatically alarm when it's over the safe value.Alarm Threshold: Electric: 40V/m; Magnetic: 0.4T Ecofriendly; Fashion -- USB rechargeable.Portable and simple design makes digital radiation testers are easy to carry around and do field measurement.Data-Locking; Backlight -- Press one botton to lock the data and clear display with blue bakclight allow you to easily read results.Accuracy: 1V/m for Electric, 0.01T for Magnetic.Measure Temperature -- Swicthable temperature units ( and ).0C-50C Colour: black Material: ABS plastic Size: about 133 x 60 x 25mm Package Contents: 1 x electromagnetic radiation detector 1 x USB cable 1 x English manual Only the above package content, other products are not included.Note: Light 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 +/- 1-3cm.