ANNJUC One charge can last for 7 hoursThe built-in 350 mAh polymer battery can be used for 7 hours on a single charge,and the battery life is longerFree your hands and liberate your naturePlay while listening to music,freedom is not restrictedFull sound of high-definition hands-free callsIntelligent noise reduction microphone,low latency,no lag and clear sound qualityNo feeling of long-term wear,as light as a Multiple optimizations of specific balance 84g weight,light and not cumbersomeBluetooth version: 5.0Connection range: 210 meters (barrier-free)Battery capacity: 350mAHOperation : buttonCharging voltage: 5V 1ASpeaker unit: dual speakers,2.5Wx2Distortion: S3%Signal-to-noise ratio: Listen more clearly 80dBCharging time: 2hTalk time: 5.5hListening time: 7h (50-60% volume),4-4.5h (100% volume)Colour:BlackMaterial:PlasticPackage Contents:1x Neck hanging wireless bluetooth speakerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.