All-in-1:Make phone call directly from the smart watch including answering and dial-up. SIM slotsupport make calls by Bluetooth Mode or Smartwatch Mode.</br>?Compatibility: All Android and iOS Mobile Phone & Android Tablet PC. Android Mobile Phone: Samsung HTC Sony LG HUAWEI ZTE OPPO XIAOMI and so on. iOS Mobile Phone: iPhone 6 iPhone 6 plus iPhone 5 iPhone 5s  iPhone 4 iPhone 4s (This APP can' t be installed by iOS Apple system can' t sync SMS and Bluetooth push information but other functions can be used by iPhone); Android Tablet PC: Samsung Nexus Onda Newsmy and so on.</br>?Function Description: Pedometer Sleep Monitor Audio Player VideoCamera Calendar Calculator Facebook Twitter Wechat Stop Watch and more</br>?Sync: Twitter Facebook; time schedule read message or news (the fuction only supports Android systemit is unavailable on iOS)</br>?2 Slots Design: The Smart Watch acts as a phone with a micro SIM card you can also write and send messages via the Smart Watch. Expand its storage for MP3/MP4 files with a TF card?? supports maximum 32G.</br></br>Product Description</br></br>reference size 56*38.5*12.5H mm environmental protection yes main screen 1.54 inches FQVGA 240*240 pixel vibration support standby time 100 hours call time 2 ho