Same Sky's microphone line is composed of electret condenser microphones which are also called capacitor microphones. What makes electret condenser microphones different than other condenser microphones is the use of an electret. An electret is a ferroelectric material that has been permanently electrically charged or polarized. Due to the high resistance and chemical stability of the material, the electrical charge will not decay for hundreds of years. The name comes from electrostatic and magnet; a static charge is embedded in an electret by alignment of the static charges in the material, much the way a magnet is made by aligning the magnetic domains in a piece of iron. This specific characteristic is a benefit to designers because an electret microphone eliminates the need for a polarizing voltage to operate a microphone.