The Japanese company Elecom has been selling their Ear Drops since 2006 and they have obviously been successful at it as they are now offering 9 more models. Weighing only 3g, the earphones are adjustable, and they have a slide adjuster to prevent tangling of the 1.2m cord. With playback frequency of 20Hz to 20kHz and a pressure response of 96dB/1mW, the Ear Drops come in three colors in three different designs. Each set will set you back ¥3,000 (~$29.00.)