Generic Health Activity Wristband For Android IOS Smartphone Black Intelligent Notification: vibration alert, never miss an incoming calls, SMS or message from twitter, facebook, skype etc User friendly design: light weight, host comes with a standard USB port, easy to get charged through PC or mobile driver Compatibility: requires Android 4.3 or above, IOS 7.0 or above os, download APP "Zeroner" from Apple Store or Google Play