321OU Bluetooth Smart Watch New Upgrade Smart Watch - Stainless Steel Wire Drawing Surface, Precision laminating process, Nano TPU85 material strap, anti-sweat matte surface treatment, ergonomic convex design and soft strap which make wearing more comfortable. Don't worry about the after-sale problems, we provide Lifetime Warranty Service without reasons. Two Working Model - Bluetooth model: Connect the smart wrist watch to your phone via bluetooth, then you can make phone call, including answering and dial-up, view and reply text messages, view app notifications and so on; SIM card model: If you install a GSM 2G/2.5G Network SIM Card into the smart watch, you can make phone call directly from the smart watch, including answering and dial-up, send/reply messages,take pictures, play music etc.. Sync Function - Just connect the smart watch with your phone via Bluetooth, then download and install the APP, so you can read Whatsapp,Twitter,Facebook and other application push messages, view and reply text messages, the time and date will be automatically synchronized. Multi-Function & Fitness Tracker Watch - Image viewer, Music Player, Sound recorder (need put and SD card ), Remote capture, Calculator, Alarm clock, Calendar,Camera (0.3M),Two way Anti-lost. Pedometer, sleep monitoring, sedentary remind, calories counter, exercise mileage counter. Android and iOS Compatible & Guarantee - This smart watch can support most android and ios phones. Such as iPhone X/8/8 plus/7/7 plus/6/6 plus/6s/6s plus/5/5s (Only Supports Partial Functions), Samsung Galaxy S9, S9 Plus, S8, S8 Plus, S7, S7 Edge, S6, S6 Edge, S5, Samsung Note 8, 5, 4, Google Pixel/Pixel XL, HTC, Sony, LG, HUAWEI, ZTE etc. smart phones.No risk, We offer 90 DAYS FREE RETURN warranty for our smart watch.