While nothing can replace the companionship of a guide dog, technology can help make treks through busy cities a lot less stressful and more enjoyable for the visually impaired. Microsoft, for one, is currently testing a new headset (developed with help from UK charity Guide Dogs) that uses 3D soundscape technology to guide its users with audio cues along the way. That bone-conducting headset can't work alone, though: it needs to be connected to a smartphone, as well as to receive information from Bluetooth and WiFi beacons placed in intervals throughout the roads users take. For its pilot program, Microsoft attached makeshift beacons on neighborhood objects in a London suburb, where its first testers are giving it a spin. When company news writer Jennifer Warnick tried it out while blindfolded, she found herself so efficient in getting around with only sounds to guide her, that she felt like a "dry-land dolphin."