Overview: Superior technology means superior sound: Experience top-shelf sound quality and bask in its incredibly powerful bass, crisp mid-highs, and crystal clear vocals, and have your own personal bubble that encompasses you in premium acoustics. Never-Drop Design-Ergonomic and never-drop design. Ultra light-weight with silicone earbuds guarantees comfortable wearing for a long time. Back-Up For Your Devices IT with a massive 2000mAh capacity battery, the charging case can provide additional charging power for your smartphone or other mobile devices. It’s a reliable emergency power supply in times of need. Specification Size: 11.3 cm * 9.2 cm * 4.5 cm Weight: about 120g-140g Color: F9-5 digital black, F9-5 digital white Transmission range: 10 meters Function: battery display, voice control, call function, support music, multi-point connection Bluetooth protocol: 5.0 Channel: Stereo Bluetooth version: 5.0 (Binaural call) Support protocols: A2DP, AYRCP, HCEP, HSP, SPP Operating temperature: -10 °-55 ° Charging voltage: 5V- 500MA Headphone speaker: φ 8mm Headphone battery capacity: 50MaH Storage box battery capacity: 2000MaH Transmission distance:> 10m Talk time: 4-5 hours Playtime: 4-5 hours Headphone charging time: 1 hour Storage box charging time: 2 hours Support system: all Bluetooth-enabled devices and hands machine Package Content 1 x Bluetooth Headset