Thinkplus X7 Wireless Headset Neckband BT5.3 Bone Conduction Design, Neckband Earbuds Flexible and Lightweight Design Metal Moving Coil Unit HIFI Sound Quality Long Usage Time Earphones for Sports Office Game Compatible with Android, IOS, WIN Systems Features: Bone Conduction Design: Open design does not isolate outdoor sound, no ear plugging or swelling. Metal Moving Coil Unit: Shocking dynamic speaker sound, precise and full treble, restoring HIFI sound effect. Immersive Gaming Experience: 360° surround sound, with antenna design for synchronous sound and picture. BT 5.3: Stable connection without stuttering, fast transmission speed, compatible with various Bluetooth devices. Flexible and Lightweight: Can be twisted and bent at will, the skeleton is flexible and not deformed, lightweight and compact, skin-friendly material. Upgraded Battery Life: 2 hours of charging, 10 hours of playback, enjoy a day without anxiety. Wide Compatibility: Compatible with various systems, including Android, iOS, and WIN, stable connection without interruption. Specification: Optional Color: Black / White BT version: 5.3 Wearing style: Clip-on design Receiving sensitivity: -80dB +3dB Frequency Response: 20Hz ~ 20KHz Battery Capacity: 150mAh Speaker unit: 16mm Bluetooth transmission distance: ≥10M Music time: about 10 hours Rated power: 0.75W  Charging time: about 2 hours Package size: 140*89*36mm Package weight: 100g Package list: 1* Earbuds 1* Charging cable 1* User manual