Save money, get smart alerts and have a battery life defies the limits of its size which can last 15 days! Pre-owned still great condition with very little cosmetic wear (see last 4 pictures). Fully operational and functions as intended. Original box, packaging, instructions, and charging cable included. App syncs with Android and iOS phones. - 9.1mm Ultra-slim - Metallic Middle frame - 19g Ultra-light - Get SMS, calls, and any app notifications right away - Water-resistance grade of 5 ATM - go swimming! - Strong & accurate GPS tracking - 5 satellite positioning systems - 24-hour health monitoring - Selection of more than 100 sports modes - Alexa built in - Personalize the look to your taste - wide selection of watch faces to choose from To read more about the features, go to https://www.amazfit.com/products/amazfit-gts-4-mini