The AquaPulse ($139.99), available in July, uses an infrared sensor attached to an athlete's ear lobe to monitor heart rate by quantifying light pulses due to capillary blood flow in the skin. That data is then communicated audibly to the swimmer by way of Finis' patented bone-conduction method, utilized in its SwiMP3 music player. Instead of fiddling with earphones that won't stay in place, bone conduction actually transmits vibrations through the temple bone and into the inner ear. According to Finis, the presence of water, and not air, makes the sound quality of bone conduction even better than the sound quality in traditional ear-buds. The entire gadget is just 3.5 inches wide by 1.5 inches long, only half an inch thick. It clips onto a swimmer's standard goggle straps.