ROCKBROS Smart Bluetooth Helmet Audio Riding Bicycle Bell Speaker Handsfree Phone Call Voice NavigationPreorder Discount Before 800 Orders$6.99   1-150 orders$7.99   151-550 orders$9.99   551-800 ordersMarket Prices: $12.04Specification:Brand: ROCKBROSColor: Black Bluetooth: 2.0+Support for APP: Android 2.3+ Charging time: About 1 hourSize: Show as the pictureOperating voltage: 3.4-4.3VWorking current: !#!amp!*!le;50mAWorking temperature: -20\u2103-50\u2103Bluetooth connection distance: 25mWaterproof: IP54Battery: 400mAH polymer lithium batteryAudio frequency response: 120Hz-12KHzAudio distortion: !#!amp!*!le;1%Audio signal to noise ratio: !#!amp!*!ge;60dBAudio output power: 3WFunctions:Bluetooth connectivity、support for android and IOS.Handsfree answer phone.Music player.Voice navigation.Voice search.APP support、for android.Features:Multifunctions、can use for bike、car、helmet etc.Recommended use for riding、running、climbing and so on.With velcro and shockproof sponge、easy to use.USB charging、one hour time full charging、82 hours standby.Lightweight、small body、large energy.If you want to know more about it、let's see the following page!Warning:1. Not includes USB cable、you can charge it use your own android USB cable.2. Bluetooth Support for Android 2.0+ and IOS 2.0+.3. APP only support for android 2.3+、not support for iphone.4. Voice functions only support for Android system.Package includes:1 x Helmet speaker1 x Pair of velcro1 x Shockproof sponge