When pacemaker or implantable defibrillator wearers carrying this Pace-alert encounter strong AC electrical, AC magnetic, or high frequency (RF/microwave) fields, the alarm will go off to warn them to walk away immediately from the sources which could interfere with the implanted devices. The alarm thresholds are pre-set, based on pacemaker manufacturer’s safety recommendations. Using state-of-the-art technology (patented), Pace-Alert is specially designed for pacemaker and ICD wearers to keep a safe distance from electrical, magnetic field (EMF) and high frequency (RF) sources to effectively prevent pacemaker interference. Detect not only low frequency/high frequency radiations, but also electrical fields common in manufacturing/factory environment. Pace-Alert stands out from other EMF detectors. Configured based on pacemaker/ICD manufacturer specifications with safety margin to give you early warning before any interference with your device. Precisely identifies low frequency (M), high frequency (RF), as well as electrical fields (E) over the warning thresholds. 3 dimensional detection means easy, accurate and speedy detection of radiations in all directions. Easy to use with E/RF/M lights indicating any radiation stronger than the thresholds. No technical background needed. Visual and audible alarms give clear indication of radiation levels in the light or in the dark. With best quality and full functionality, Pace-Alert is ideal for medical device users at home or at work where strong EMF sources might be present. One year warranty. Battery: 9V (not included). With visual and audible alarm. Alarm for AC electric field, Alarm for high frequency and Alarm for AC magnetic field. Frequency range: 30 Hz to 5.5 GHz. 4 lights display, green/red/red/red for power/electric field alarm/ RF alarm/magnetic field alarm. Calibrated at 50/60 Hz and 2.4 GHz. Current: 30 mA.Measures 6cm length by 2.6cm width by 13.4cm height.