Newly Designed Driver #34;f-Core for Wireless #34;. With the ZE3000, instead of fully depending on the equalizer, we #39;ve improved the fundamental performance of the driver units and optimized the acoustic space inside the earbuds to perfect the sound quality. #34;f-LINK Damping System #34; to Optimize Internal Pressure. The ZE3000 features a new #34;f-LINK Damping System #34; that optimizes the pressure in the acoustic space inside the earbuds housing to create a sound equivalent to wired earphones without the need for external vents. Compatible with aptX Adaptive. Compatible with a wide range of iPhone and Android devices and easy to pair. In addition to the SBC and AAC, it also supports the uninterrupted, high-quality aptX. It also supports 48kHz/24bit wireless transmission using the Qualcomm aptX Adaptive. Design for Custom-Like Fit. The ZE3000 achieves a superior fit based on the housing design, which is the optimum solution for in-ear fitting established with our conventional wired earphones. Whether or not the earbuds are comfortable to wear depends on how little oppressive they are. IPX4 Water Resistance. The IPX4 Water Resistance rating makes ZE3000 suitable for sports and active lifestyles. Rapidly changing weather conditions will not stop you from enjoying your favorite music or other entertainment contents. Single Ear Mode. Simply return one earbud to the case and the music will automatically switch to #34;Single Ear Mode #34; without interruption. In #34;Single Ear Mode #34;, stereo playback is switched to monaural playback* so you can enjoy music with one ear without any discomfort. Earphone Specification : Bluetooth Connection : Bluetooth 5.2 Supported Codecs : aptX Adaptive, aptX, AAC, SBC Continuous Music Playback : Maximum 7 Hours / Maximum 35 Hours with case Charging Time : Earbuds for 1.5 Hours / Case for 2 Hours Battery Capacity : Earbuds for 35 mAh / Case for 300 mAh Free : SpinFit CP1025 (Random Size)