GS8 Ultra Series 8 Men Smart Watch 2.05” Full Display ERK 2013-2 Device: GS 8 Ultra Shape: Square Dimension: 45*38*11.5mm Weight: 50g Colors: Black, Silver Display: IPS Screen Size: 2.05 Inch Screen Resolution: 420*485 pixels Compatible: Os Android & IOS Sensors:Heart rate Sensor ,G Sensor Bluetooth: V5.0 GPS: NO Speaker :Yes Microphone: Yes Multi-sports mode :Yes Heart rate monitor: Yes Blood Oxygen Monitor :Yes Blood Pressure Monitor: Yes Waterproof: IP67 Waterproof Additional Features: Bluetooth calling Sedentary reminder Sleep monitor Alarm Barometer Brightness Adjusting ….etc Battery Capacity 250 mAh Normal usage 2-5 days App name WearFit Pro Strap Silicone