SIM and TF 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>Make and receive phone calls directly from the smart watch.</br>Fully compatible with Android Powered smart phones. Please be noted?? Message notifications?? Facebook & Twitter Notifications are unavailable for iPhones?? WP phones and blackberry phones.</br>Pedometer?? Sleep Monitor?? Audio Player?? Video??Camera?? Calendar?? Calculator?? Facebook?? Twitter?? Stop Watch etc</br>Sync Function: Check all notifications on the cool little Smart Watch. Facebook?? Twitter?? Messages etc</br></br>Product D