Specification:   Item Type: Wristwatches   Style: Casual !#!amp!*!amp; Fashion !#!amp!*!amp; Sport !#!amp!*!amp; Outdoor    Operating System: Andriod 4.3 or Above \/ IOS7.0 or Above   Bluetooth Version: BT 4.0    Battery Capacity: 230mAh (Button Battery)  Standy Time: More than 6 Months   Case Shape: Round   Case Material: Alloy、 Stainless Steel  Glass Material: Sapphire Crystal  Back Cover Material: Stainless Steel   Band Material: TPE (Better than silicone material、 anti sweat、 anti dust、waterproof)   Dial Diameter: About 4.2cm  Dial Thickness: About 1.0cm  Band Width: About 2.0cm  Band Length: About 22.4cm   Color: Black、 Silver   Water Resistant Depth: IP68 Waterproof (Can Swim、 Dive (within 30 meters))    Features:  1. Call、 SMS Reminder  2. Sleep Monitor、 Passometer、 Calorie Calculator、 Movement tracking、 Sports goal  3. Data Sharing  4. Low Power Consumption  5. Remote Capture  6. Anti-lost  7. Alarm         Package included:   1 X N20 Smart Watch   1 X Chinese and English Manual  1 X Cover Opener       Notice:   The picture is only for reference、 please consider carefully before purchase.