Metrophones (Stereo headphones w/built-in metronome) are another great product designed with the drummer in mind. High quality stereo headphones can be plugged into any audio sound source. The built in electronic metronome features an on/off switch, volume control, a line out jack and a 440 tone for tuning reference. Add 29db of isolation, and you've got a versatile pair of phones. Liquid filled ear cushions, and a 9 foot heavy duty stereo cable ...