Here is a pair of earphones that provide you with rich audio experience on the go. The RHA CL2 Planar earphones have detachable MMCX housings with wired and wireless options. The battery life lasts up to 12 hours. These headphones have 89dB sensitivity and frequency range of 16 – 45,000 Hz.
The CL2 Planar comes with a fully flexible silicone neckband. The bad news? Something like this is not cheap.