The Rolls EB77 earbuds feature excellent sound quality and were designed for use with their best selling Personal Monitors (PM351, PM50s). Delivering clean, clear audio quality, the EB77 earbuds feature cobalt magnet drivers and robust mylar cones to deliver 30Hz to 20kHz frequency response and 109dB SPL. These earbuds are comfortable, compact, and loud. The EB77 earbuds have a 3.5mm gold plated stereo plug plus the cable is 44 inches in length.