HBS-900S Sports BT Earphones Neckband Lightweight Headphones 15H Music Playtime Noise Reduction Handsfree Headset With HD MicrophoneFeatures:Unique neck-strap design for easy carryingUltra-light weight for all day comfortRetractable EarphonesNoise reduction & Echo cancellationA2DP, music player supportSame time connect two phonesCalls vibrationLossless sound transmissionAmazing Battery Life, music time up to 15 hours and talking time 20 hoursCrystal clear soundThe Noise Cancelling quality for calling sounds natural and works great.Smart neckband design, no need to worry that the earbuds will drop off.Specifications:Model: HBS-900SBT version: V4.2+EDRTransmission distance: 10 meters (Obstacle free)Battery capacity: 350mAhTalk time: 20 hoursMusic time: 15-20 hoursStandby time: 200 hoursCharging time: 1-2 hoursSpeaker1610mW x 2Sensitivity: DBM -80Signal to noise ratio: 95dBBearing: all directionsFrequency range: 20Hz-20KHzTransmit power: 0dBm. Second (4dBm Max)Working voltage: 3.7VPackage Size: Approx. 20*17*2.5cmPackage Weight: Approx. 106g Package List:1 * BT Headphone1 * USB Charging cable1 * User Manual