This smart watch must be used in conjunction with the phone APP--Veryfit.

Android system needs Android 6.0 or above, and iOS needs iOS 9.0 or above.

1. Charge to activate.

2. Scan QR for VeryFit App.

3. Open App, register.

4. Scan QR or find IDW19 in App to bind via Bluetooth.

Fit wrists 5.8 ~8.7 inches.

The original watch band is a universal size of 22mm, made of waterproof and hypoallergenic silicone material.

Should you prefer a different style or material, simply search for "22mm watch band" on Amazon.

The baisc functions mentioned on this product details page can all be used without additional payment.

1. Enable sleep tracking in the Veryfit App.

2. Ensure the watch fits snugly before sleep, avoiding tightness or looseness.

3. Aim for over three hours of sleep without disturbances like frequent waking or restlessness.