Do you know you are exposed to more and more electromagnetic field (EMF) radiation that may cause harm to your health and well-being. This E-alert will detect EMF strength of all electrical appliances in your environment, and the manual tells you how to protect you from this danger. Smallest detector in the world. Small yet sensitive, radiation finder mini is ideal to be attached to a key chain and carry anywhere. Use this ultra compact device to choose the appliances or cell phones with the lowest radiation levels or to keep a safe distance from radiation sources at home and at work. For cell phones, routers, microwave ovens, power lines, TVs, computers, electrical fans, AC alarm clocks, hair dryers, vacuum cleaners, and washers and dryers. Weighing only 0.7 oz and the size of a gum, easy to attach to a key chain or throw in the pocket/purse. 3 dimensional detection means easy, accurate and speedy detection of radiations in all directions. Detect both low frequency (LF) and high frequency (RF) radiation strength of all household appliances and wireless devices. Easy to use with Safe/Caution/Warning lights. No technical background needed. Visual alarms give clear indication of radiation levels in the light or in the dark. Battery included. Indications: Green light: No EMF or HF radiation detected or it is at safe level. Yellow light: EMF or HF radiation is strong. Red light: EMF or HF radiation is very strong. Battery: CR2025 3V (2 batteries included). With visual alarm. 3 lights display, green/yellow/red for safe/caution/warning. Frequency range: 30 Hz to 5.5 GHz. Calibrated at 50/60 Hz and 2.4 GHz. Measures 3cm length by 1.2cm width by 8.5cm height. One year warranty.