Hamilton’s complete line of personal and deluxe headsets all feature patented ASMTM (automatic stereo/mono) technology for use with virtually all school audio equipment. Deluxe headsets feature soft leatherette-style ear cushions which are noise reducing, washable, replaceable and comfortable as well as a three-meter coiled cord. The Hamilton™ personal line is first headphone designed to combat the spread of head lice in schools with the use of individual resealable, write-on bags. Kills lice in 24-48 hours without the use of chemicals. Personal units are available with foam or leatherette ear cushions and with or without volume control. All units have a full one year warranty. All are Stereo/Mono, with 1/4" plug.