Tribeca Genuine Wood Ear Buds for Kindle Fire, Bubinga Certified "Made for Kindle" accessory (Kindle Fire and HD Models) Sound chamber crafted from genuine, natural wood creates an unparalleled acoustic experience Driver features moving coil dynamic speakers with 18Hz-22Hz frequency response; Sensitivity 110+/-3dB at 1kHz, 1mW Output power is 5mW rated (10mW max)