Can test electric field and magnetic field radiation at the same time --- our EMF electromagnetic radiation detector (test range: electric: 1-1999V/m; magnetic: 0.01-99.99T). Sound and light alarm, when the test result exceeds the safe value, the instrument will automatically alarm (alarm threshold: electric: 40V/m; magnetic: 0.4T). Data lock, one-key lock radiation value, built-in electromagnetic radiation sensor EMF (test bandwidth: 5Hz-3500MHz, sampling time: about 0.4 seconds). Radiation value trend LCD graphic display: radiation evaluation, reminding you whether the radiation value is safe, dual measurement display of electric field and magnetic field on the instrument, average/ switching button function. Built-in rechargeable lithium-ion battery (with USB charging cable), stylish design, easy to use, easy to carry or on-site measurement. Colour:black+red Material:ABS plastic Size:18 x 13 x 5.5cm Package Contents: 1 x Radiation detector 1 x USB data cable 1 x English manual Only the above package content, other products are not included. Note: Light reflection 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.