There are 8 types of watches of this model. This product is Type C black with positive display. The watch from Next Generation. Time to innovate with this higher level of Multi-function.</br>[Functions] ?User Mode Synchronize with your smartphone by Bluetooth Summer time ON/OFF Notices of phone call mail message and others by Sound and/or Vibration SOS call (Only available on Android phones) Remote shatter button for your smartphone Smartphone searcher Smartphone app to search the watch ?Pacer Mode Set how many times to ring signal sound per minute. It helps to run/walk in certain pace.</br>?World Time Mode 24 cities ?Current Time Mode Display Current Time and Calendar ?Stopwatch Mode Range: 99:59:59 Count time Measure lap time/ split time ?Timer Mode Range: 99:59:59 ?Alarm Mode 5 Alarms ?EL Backlight ?50 Meters water resistant</br>[Attentions] Applicable OS: Over Android 4.3/iOS6.0 Notes for Android users: Some devices of Android 6.0 are found to have some problem on connecting. Notes for iOS users: Remote shatter function may not work properly when taking horizontal photos. Now we are trying to solve these problems.</br>[Material] Case: ABS Belt: Polyurethane [Size] ??Case Type A: H59 x W49 x D17 mm Type B: H53 x W51 x D17 mm Type C: H46 x W46 x D15 mm Type D: H47 x W47 x D15 mm ??Strap Type A Length: 18 - 23.8 cm Width: 22 mm Type B Length: 18 - 23.4 cm Width: 22 mm Type C Length: 15.2 - 21.4 cm Width: 22 mm Type D Length: 16.7 - 22.2 cm Width: 24 mm ??Weight Type A: 73g Type B: 71g Type C: 63g Type D: 66g [Accessories