The Miniguide Mobility Aids is a handheld device that uses ultrasonic echo location to detect objects in front of the walker. Vibration rates increase as the walker gets closer to the object. The Miniguide should be used as a complement to a white cane or guide dog. 5 different detection ranges can be set from 1.5 feet to 24 feet, depending on the users environment and skill levelpreferred ranges can be set up on a preset setting for quick toggling between up to 3 preset rangesaudio feedback is available both for training purposes or as an alternative to vibration, when used with an earphonelow battery warninguses 1 CR123 lithium battery, included