Y3 smart call watch with USB 3.0 interface,charging watch 2 hours can support call 5 hours. Via connecting to the suitable APP via Bluetooth,the fitness tracker issues notification including call reminders,SMS reminders,and social media alerts for Facebook, twitter, whats App also can regard it as earphone to listen to music when you take a car. Tracks your activity data all day long including GPS,steps,distance,calorie consumption and more. Detects your sleep hours,while identifying both your deep and light sleep hours,comes with an alarm clock function with vibration reminders. Compatible with Bluetooth 4.1,android,iOS with 0.96 OLED.