Perfect Smartphone Companion Android 5.1 OS Pre-installed with Android 5.1OS, like the Android smart phone, you can install your favorite Apps from App Store, such as Facebook, Twitter and so on. No.1 D5+ smart watch gives you a full Android experience. WiFi Connection No.1 D5+ smart watch support WiFi, you can surf the Internet with high speed network. Bluetooth Connection Connect it make phone calls, receive and send SMS. 1GB RAM + 8GB ROM Equipped with 1GB RAM and 8GB ROM, No.1 D5+ smart watch runs more smooth, and you can save more data in it. Pedometer Count how many steps you have walked, how far you run and how much calorie you consumed. You can enjoy doing sports. Sleep Monitor Monitor whether your sleeping is well or not. Heart Rate Monitor The custom heart rate sensor in No.1 D5 smart watch can help gauge your intensity during workouts to improve overall calorie tracking. Life Waterproof Protect No.1 D5+ smart watch from water (Not for swimming or taking a shower). Brand: NO.1 Model: D5+ CPU: MTK6580 Sensor: Gravity Sensor OS: Android 5.1 Smartphone OS Compatibility: Android 4.3 or above, iOS 7.1 or above SIM type: 1 SIM Card 1 Standby(Micro SIM card) Bluetooth: 4.0, 2.1 RAM: 1G ROM: 8GB Screen Size: 1.3" Resolution: 360 x 360 Screen Type: LCD Standby Time: About 120 hours Battery Type: Rechargeable Lithium Polymer Battery, Polymer Battery Battery Capacity: 450mAh Features: Bluetooth, Barometer, Pedometer, Weather Forecast, Heart Rate Monitor, Time Display, Sedentary Reminder, Sync Phonebook, WiFi, Bluetooth Dialing, Gravity Sensor, Caller ID, Google Play Language: Chinese, English, French, Russian, Korean, German, Spanish, Arabic, Portuguese, Italian, Swedish, Turkish, Persian, Indonesian, Hebrew, Czech, Vietnamese, Bahasa Melayu, Finnish, Filipino, Croatian, Lithuanian, Hungarian, Norwegian, Slovak, Bulgarian, Ukrainian, Burmese, Roman, Japanese Case Material: Metal ?Case Color: Black, Silver Band Material: Leather Band Color: Black Net weight: 78 g / 2.75 oz Size: 46 x 55 x 12 mm / 1.81 x 2.17 x 0.47 inch