The LUF-BA1 is a universal model with a balanced armature screwdriver from the custom IMM brand "LEAR". The product name LUF is the initial letter of LEAR Universal Fit. Ordinary universal model earphones have limited shape and design due to the traditional production process and couldn't ask for precision. We have spent over 2 years of analyzing and researching over 2,000 pairs of ears based on 10 years of experience in custom earbud manufacturing to achieve an ergonomic fit and sound isolation. In 2015, we introduced new 3D scanning and printer technology, and after eight model modifications to create the LUF-BA1, a universal model that was comfortable and unable to reach with traditional earphones. The LEAR BAF (Full Range) driver is specially designed to eliminate the traditional round acoustic output, and are flat shaped. This allows you to hear the sound directly from the BA, so you can hear the bass sound as it is. High efficiency Arnico 48/16 magnet provides high sensitivity and low distortion. The vibration version uses high quality AL/PET (Aluminum Mylar) to provide more balanced bass and treble.