Other unconventional liquid hydrocarbons include production from oil sands, ultra-heavy oils, gas-to-liquids technologies, coal-to-liquids technologies, biofuel technologies, and shale oil.Unconventional natural gas can be of several types.ther unconventional liquid hydrocarbons include production from oil sands, ultra-heavy oils, gas-to-liquids technologies, coal-to-liquids technologies, biofuel technologies, and shale oil.
Unlike standard headphones, which use relatively large drivers (speakers) and fit on top of or around your ears, or earbuds, which use fairly small drivers and sit loosely in your outer ears, in-ear-canal headphones use very small drivers and actually fit inside your ear canals (thus the name canalphones).
Home > Headphones, Earphones & Earbuds > Earphones for Sleeping & Pillow Speakers. If you like to listen to music while you drift off to dreamland, then earphones for sleeping are exactly what you need. These earphones for sleeping are designed with two main features in mind: comfort, and staying put while you sleep.