W4S Fitness Tracker Wristband Sport Activity Monitor Step Counter Heart Rate Montior Bluetooth Smart Bracelet Power by winding spring manually

Power by winding spring manually (no need battery)

7V Input: DC 5V Battery Capacity: 2000mAh Battery Type: Built-in Rechargeable Battery Size: 82 x 70 x 70 mm / 3

Built-in over charge / discharge / current / power / heat and short circuit protection keep your devices safe

IP Camera 960P WiFi Wireless HD

With larger capacity 2600mAh rechargeable lithium battery that can provide long-lasting light

W4S Fitness Tracker Wristband Sport Activity Monitor Step Counter Heart Rate Montior Bluetooth Smart Bracelet Power by winding spring manuallyProduct Features: Great Craftsmanship W4S wristband built in 0. 96 inch OLED display screen, clearly showing the date, clock and battery power. It looks fashion and thin. Silicone watchband with adjustment holes, wear it comfortable and valuable Dynamic Heart Rate Monitor 24 hours dynamic heart rate detection, Built in heart rate monitor sensor and 3 axis acceleration motion sensor let heart rate data more accurate Activity Tracking for Workouts It