Apple Watch Series 1 38mm Space Gray Aluminum with Black Sport Band Brand new factory sealed in retail box Series 1 Apple watch. work with iPhone 5 or later, not compatible with Android phone Activity and Heart Rate Monitoring Changeable Faces with Widgets Bluetooth 4.0, 802.11b/g/n Wi-Fi Apple watchOS 3; up to 18 hours battery time Taptic Alerts Apple Pay; S1P dual-core processor; Splash resistant Siri Integration Displays Notifications and Runs Apps