Appearance: zinc alloy + IML Memory: 512M (support local music) Sensor: Silan Micro SC7A2O Heart rate sensor model: LC09A 1. Main core model: JL7012 2. Battery: capacity 220mAh polymer battery; 180 minutes to fill APP: Wearin OS 3. Screen size: 1.91 inch full fit square 4. Screen resolution: 240*296 5、BT3.0/Ble5.1 6. Charging method: magnetic wireless