The Signatur T-Bar Hybrid Smartwatch boasts a range of smart features in the body of a classic watch. By connecting to your Android or iPhone and the SKAGEN app, the watch automatically updates to the correct time and date and sends you discreet notifications when you receive a text, email or call. It runs on a standard replaceable CR2025 coin-cell battery. Features:   Discreet Alerts Non-Charging - Replaceable CR2025 Battery means no charging required Automatic Accuracy Activity Tracking System Requirements: Android OS 5.0+, iPhone 5/iOS 9.0+ Connectivity: Bluetooth Smart Enabled / 4.1 Low Energy