Boat M-521 Earphone

Speaker size:10mm Frequency range:18-20,000Hz Sensitivity:116±3dB(at 1 KHZ 0.5ms) Cable length:130cm Product features: -Applicable to the 3.5 foot interface of intelligent Mobile phone -The stereo output dynamic combination - The built-in mic handsfree . ! WARNING! Adjust earphone sound to the proper volume to avoid ear damage. Never use an earphone while riding a bicycle, a motor bike or driving a car. It is dangerous to increase the sound volume too high because you can't hear the extend sounds. Take great care about traffic around your. Please don't pull the cord too hard in case of breakage.