The world health organization lists the five major effects of electromagnetic radiation on humans 1. Electromagnetic radiation is the main cause of cardiovascular disease, diabetes and mutation. 2. Electromagnetic radiation injury to human reproductive system,nervous system and immune system; 3. Electromagnetic radiation is the inducing factorofabortion, infertility and abnormal fetus of pregnant women 4. Electromagnetic radiation directly influences the development of children and bone development, resulting in decreased vision, lossofretinal detachment and liverhematopoiesis The electromagnetic radiation may decrease the physiological function 100% New Product Number: ET825 Product Name: Electromagnetic Radiation Detector Reading display:3-1/2-digit LCD Testing bandwidth:5Hz-3500MHZ Sampling time:About 0.4 seconds Test mode:Bimodule synchronous test Over range indication: LCD displays "1" Operating temperature:0℃~50℃ Operation humidity:relative humidity Less than 80% Measuring range: 0.01~19.99 (T) Operating voltage:1.5V AAA color: Black Material: ABS Application: For Household Electric Appliance Detecting Radiation Package Contents: 1 x Electromagnetic Radiation Detector With 3 Battery 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.