Altec Lansing CHP223 Classic Series Behind the Neck Headphones. The CHP223 from Altec Lansing is a pair of inexpensive behind the neck headphones that is perfect for the mobile user. 36mm neodymium drivers provide excellent audio quality, and the on ear design allows you to maintain awareness of your surroundings. The interchangeable color earpads have soft foam cushions for long lasting comfort. A volume control is built into the cable for quick and easy adjustments without reaching for your CD or MP3 player. The cable has a standard stereo mini plug for compatibility with all kinds of audio devices. The plug is gold plated for excellent conductivity.