About UB-111 Champ Earphone The UB-111 In-Ear stereo headphones from ubon research provides professional-quality audio in a lightweight and comfortable design ideal for traveling professionals. Driver balanced armature drivers to produce detailed, realistic audio with better than 86% accuracy from 20 Hz to 20kHz. The Headphone is designed for the serious audiophile to provide an ultimate experience in sound reproduction. It is used in various devices such as for iPod, tablets computers, field recorders, smartphones, and more. This headphone features a frequency response of 20Hz to 20kHz. It uses dual balanced-armature drivers in conjunction with a 3-way crossover to provide another level in the listening experience. It features 40dB passive noise attenuation to suppress outside noise. Enriched sound and reliable quality in all aspects of its design, strong bass generated from powerful driver.