1More Quad Driver earphones use 1 dynamic driver (round) for bass and three armature drivers (like tiny boxes with reeds inside) for the high frequencies to provide awesome clarity and value.
1More are using each type of driver for the frequency range it excels at. The Quad Driver is a 3 way design, with a woofer, 2 tweeters and the 4th driver a super-tweeter. The housings are aluminum, there are Kevlar core cables for durability and oxygen free copper wire for a high sound quality connection. There is an inline mic and controls, fully functional with both IOS and Android phones. Nice black, hard shell leather case, 6.5mm adaptor, airplane adaptor and 9 sets of ear tips are included.
weight: 18.5g cable: 1.25m frequency range: 20-40,000Hz impedance: 32 ohm sensitivity: 99dB Plug: right angle; 1 year warranty