When stationary, the Qi-Shield provides an EMF protection field of 8 ft. radius (16 ft diameter) in width and 5 ft. radius (10 ft. diameter) in height. When mobile, the Qi-Shield provides an EMF protection field of 5 ft. radius (10 ft. diameter) in width. The Qi-Home Cell creates an EMF protection field of 25 ft. radius (50 ft. diameter) in width and 16.5 ft. radius (33 ft. diameter) in height, protecting your family against mobile phone radiation, WiFi, electrical frequencies, electro-magnetic frequencies. The Qi-Max Cell creates an EMF protection field of 164 ft. radius (328 ft. diameter) in width and 115 ft. radius (230 ft. diameter) in height, protecting your family, workplace and business against mobile phone radiation, WiFi, electrical frequencies, electro-magnetic frequencies. This is the most powerful Qi-Technologies product.