Apie Bluetooth Wireless Sports Stereo Headphones Running Jogging Workout Exercise Gym in-Ear Earbuds Microphone All Bluetooth Devices Exclusive tuning technology triband clear, natural, unique sensing technology to suppress high frequency glitches. Uses magnetic neodymium iron boron magnets strongest drive unit, equipped with high - performance systems. Using powerful high-performance neodymium magnet moving coil drive unit, can achieve higher sensitivity and wide frequency response. Sophisticated technology, one piece metal casing to prevent accidental vibration and noise. The ultimate music experience. Ample low frequency, voice full of pop, rock, country music and other styles of music interpretation particularly in place.