The stylish second-generation Citizen CZ Smart Hybrid Sport smartwatch with *18-day battery life syncs with your body and your style. So you can live smart and look smart. With a sleek 42.5mm gold IP case, the CZ Smart Hybrid Sport smartwatch is now available with an interchangeable 22mm darkleather strap. Inspired by the rich design of Citizen's iconic timepieces, CZ Smart marries innovative science from NASA and technology from IBM Watson(R) with the style and quality you expect from Citizen. Call up Amazon Alexa(tm) with the built-in mic, track and monitor heart rate, and anticipate patterns of fatigue and alertness with Citizen's proprietary wellness app YouQ. CZ Smart YouQ provides a 36-hour forecast ahead and offers highly personalized insights and suggested Power Fixes, actions to help you improve alertness and promote the building of better habits, readying you to meet whatever the day may bring. Additional functionality from the Citizen Connected App delivers the latest Golf Report and Live Sports. You can even sync to your Nest, or August(R), Yale(R) Lock smart systems and other features through the Riiiver platform. Compatible with both iOS(R) and Android(tm), the CZ Smart Hybrid Sport smartwatch runs on the Citizen Connected app. Supported features may vary between countries with compatibility subject to change. *Battery life varies based on usage. This device and its related software are not intended for use in the diagnosis, cure, mitigation, treatment or prevention of disease or other conditions. iPhone is a trademark of Apple, Inc. 42.5mm gold ion-plated stainless steel case Impact and shatter-resistant mineral crystal Lug Width: 22mm Black analog-digital dial with a digital LCD display, a minute track, and luminous accents Darkleather buckle strap YF30 Google Wear OS movement (CZ Smart is powered with Wear OS by Google(tm) and is compatible with both iPhone(R) and Android(tm) phones.) Alarm Calendar/Day/Date Chronograph Dual time zone/world timer Backlight Bluetooth connectivity Calendar event notification Call Connectivity features iPhone and Android Bluetooth Vibration Alert: email Activity progress tracker - track steps/distance/calories burned/sleep/personal goals Take remote photos Control music Volume adjustment Splash resistant Citizen Style #: JX2012-09E.