Garmin Forerunner 570, 42mm, Advanced GPS Running and Triathlon Smartwatch, AMOLED Display, Training and Recovery Features, Slate Gray Aluminum with Translucent Black/Black Band Our brightest AMOLED touchscreen display with button controls and an aluminum bezel in 42 mm size to fit smaller wrists Up to 10 days of battery life in smartwatch mode and up to 18 hours in GPS mode for a more complete picture of your training and recovery Train for an event, achieve a milestone, or improve your fitness with Garmin Coach training plans; these running and triathlon plans are personalized to you and adapt based on your performance and recovery Training readiness score is based on sleep quality, recovery, training load and HRV status to determine if you’re primed to go hard and get the most out of your workout (data presented is intended to be a close estimation of metrics tracked) Built-in microphone and speaker let you make and take phone calls from your wrist when your watch is paired to your smartphone — and you can even use your smartphone’s voice assistant to respond to text messages and more Using indicators such as HRV status, recent exercise history and VO2 max, get insight into training effectiveness with training status — and know whether you’re training productively, peaking or strained (data presented is intended to be a close estimation of metrics tracked) Get personalized daily suggested workouts adapted to match performance and recovery Operating System Garmin OS Memory Storage Capacity 8 GB Special Feature Activity Tracker, Alarm Clock, GPS, Multisport Tracker, Notifications Battery Capacity 50 Milliamp Hours Connectivity Technology Bluetooth, USB Wireless Communication Standard Bluetooth Battery Cell Composition Lithium Ion GPS Built-in GPS Shape Round Screen Size 1.2 Inches