Single dynamic driver in-ear by Korean micro-speaker company called Dynamic Motion.
Radically reduces external noise that interferes with your music. Ends dangerously loud music struggling to compete with mowers, chain saws, hammers and other loud sounds. Hearing Protector Type: Noise Isolating Earbuds, Noise Reduction Rating (NRR) (dB): 24, Pairs (qty.): 3, Case Included: Yes