The 10mm enlarged dynamic drivers are 20% bigger than the regular ones and can produce music with up to 70% more bass and detailed treble. For regular listening, these Bluetooth neckband headphones feature a well-balanced sound and may be switched to Bass Up mode for heavy pounding. To make sure the person on the other end can hear you properly, voice pick-up is improved and background noise is muted in real-time. built with a malleable steel core and flexible outer shell for shape-retaining ergonomics. These Bluetooth neckband headphones are comfortable to wear around your neck all day long without becoming tired.