Africa has a severe shortage of doctors and other healthcare professionals. So Africa Health Placements sent a direct mail containing a pressure activated device to recruit foreign doctors to work in Africa. Once opened, a message prompts doctors to place their stethoscope on the device, this activates a pre-recorded MP3 that speaks directly to them. The audio for the ad was recorded at a low level so that it was only audible through a stethoscope. Turning something that every doctor possesses into an advertising medium to create the world's first stethoscope audio ad.