Bracelete Helps Sight-Challenged Navigate

"Based on the resonance location system (echo) used by bats and dolphins to navigate, Marco Antonio Trujillo Tejeda and Cuauhtli Padilla Arias, mechatronic engineers from the Tec de Monterrey in Mexico, devised a bracelet that makes mobility simpler and safer for the blind," reports Science Digest. "Sunu band bracelet emits high-frequency sound waves (30 pulses per second) that bounce after hitting an object and are recorded by a proximity sensor that calculates the distance, which translates into vibrations directly into the wearer's wrist; as the person get closer to the objects, the pulses will be more frequent." Read more.