Perfect Smartphone Companion Android 5.1 OS Pre-installed with Android 5.1 OS, like the Android smart phone, you can install your favorite Apps from App Store, such as Facebook, Twitter and so on. NO.1 D6 smart watch phone gives you a full Android experience. WiFi Connection NO.1 D6 smart watch supports WiFi, you can surf the Internet with high-speed network. 1.63 inch IPS Touch Screen Best suitable screen size with high definition picture displaying gives you great experience. Virtual Button It is more convenient that you not only can operate the watch by touch screen, but also the virtual button. Dial / Answer Phone Calls, Receive and Send Message Like a smartphone, you can make phone calls, receive and send SMS with it. Remote Notifications When there is SMS, incoming call or message from Twitter, Facebook or other applications on the connected phone, the watch will alert you to read them. Bluetooth Sync Connect it to start data synchrinization without cable. Playing MP3 Music You could play MP3 music on this watch by connecting smart phone with Bluetooth. Playing MP4 Video You could play MP4 video on this watch. Pedometer Count how many steps you have walked, how far you have run and how much calorie you have consumed. You can enjoy doing sports. Heart Rate Monitor The custom heart rate sensor in NO.1 D6 smart watch can help gauge your intensity during workouts to improve overall calorie tracking. Barometer Built-in barometer sensor, they can make a lot of sense during your outdoor sports. Original Android OSWi-Fi, 3G Network SupportHD ScreenHealth MonitoringDownload more dial/show personality style Brand: NO.1 Model: D6 CPU: MTK6580 Sensor: Gravity Sensor, Heart Rate Sensor OS: Android 5.1 Smartphone OS Compatibility: Bluetooth 4.0, Android 4.3 or above, iOS 7.1 or above SIM type: 1 SIM Card 1 Standby(Micro SIM card) 3G Network Frequency: WCDMA 850/2100MHz 2G Network Frequency: GSM 850 / 900 / 1800 / 1900 MHz Bluetooth: 4.0 RAM: 1G ROM: 8GB Screen Size: 1.63" Resolution: 320 x 320 Standby Time: About 72 hours Battery Type: Rechargeable Lithium Polymer Battery Battery Capacity: 450mAh Charger: Point-contact Charging Features: Bluetooth, Barometer, Pedometer, Weather Forecast, Chronograph, Calendar, Alarm Clock, Call Reminder, SMS Reminder, Heart Rate Monitor, Time Display, WiFi, Bluetooth Dialing, Hand-free calls, Recording, FM, Audio Player, Video Player, Gravity Sensor, Caller ID, SMS, Siri, Browser, Sync SMS, Google Play, Virtual Button Language: Chinese, English, French, Russian, German, Spanish, Portuguese, Italian, Turkish Case Material: Stainless Steel ?Case Color: Black, Golden, Silver Band Material: Leather Band Color: Brown, Black Net Weight: 54.5 g / 1.92 oz Size: 55 x 37.5 x 11.5 mm / 2.17 x 1.48 x 0.45 inch