1.Built-in 2800mAh rechargeable lithium-ion battery, standby to 170hours and full charge need 2 hours.2.Bluetooth 5.0 motorcycle helmet headset,ensures pairing and maintains a strong connection up to 30 Meter.3.Suppor handsfree function,When the phone is connected with Bluetooth helmet headphones and there is a call, the call will be connected automatically. Don't worry about missing important calls. Just click the multi-function button twice to wake up the voice assistant to call everyone you need4.Hi-Fi Sound Quality and Adjustable Volume Helmet Wireless Headset adopted DSP noise reduction technology. According to different environments to adjust volume, Hi-Fi speakers make you enjoy crystal clear voice calls and music from your cell phone5.Build-in FM function,you can learn the latest information anytime, anywhere6.IP54 Waterproof Headset, that you can use our products even on rainy days7.It is a helmet headset,not a intercom,can't connect with others,can't talk with passengerModel: A30Waterproof grade: IP67Battery capacity: 2800mAhHeadphone size: 9x3.5x1.7cmBluetooth transmission distance: 30mCharging time: 2 hoursWorking hours: 170 hoursColour:blackMaterial:ABS+SiliconePackage Contents:1X Helmet Headset1X USB charger cable1X microphone2x Noise-cancelling windproof cotton4X Nylon Sticker1X English manualOnly 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.