AFyou Smart Bracelet Watch Bluetooth Wireless Fitness Headphones Wristband for IOS and Android (Silica Gel Black) 2-in-1: Combined with Bluetooth Earphone Listening Music, Hands-free Phone Calling, Sleep Monitoring Features Smart Tracker Bracelet Sport Healthy Management: Manage Your Pedometer, Calories, Sleep and Alarm Reminder. etc. Main Function: Bluetooth Phone Call, Listening Music, Alarm, Sports Tracker, Sleep Pedometer, Anti-lost, Screen Display etc. Bluetooth Version: Support BT 4.0, Bluetooth Phone Calling Support BT 3.0 Phone Version: above Android 4.3, above Iphone 4s and IOS 6.1