Be compatible for android cellphone(OS must be Android 4.3 or above and bluetooth must be V4.0),for Iphone(OS must be IOS 7.0 or above and bluetooth must be V4.0). Water Resistant Sim/Memory/ Bluetooth Support Introduction: The y6 Smart Watch is a fashionable watch with innovative technology.With adjustable wristband, you can wear it comfortably no matter when and where, such as running or climbing. Furthermore, it can be connected with smart phone and when you have calls or messages, it will remind you and you can receive calls and read messages by watch.In a word, it is the best companion for smartphone and it is also the bast product for yourself and your families. Main feature: Bluetooth Function With bluetooth V4.0, this smart watch is available for smart phones with bluetooth function. Sync Function Sync phonebook with the smartphones; Remote Capture You can take photos of whole family without other help, just use “remote capture” function.(for iphone, when you use this function, you should open the phone camera first.) More convenient features: Time sync, Language sync(Language sync only for Android Phone) Other features: Recorder, Alarm, canlendar, Music