Garmin Forerunner 235, GPS Running Watch, Black/Red WRIST BASED HEART RATE - Forerunner 235 utilizes Garmins very own wrist based heart rate sensor that tracks 24/7 - Activity Tracking Accuracy LARGER SCREEN - A 44% larger screen than the 225 but the same physical size BATTERY LIFE - Up to 9 days in watch mode; up to 11 hours in GPS mode with HRM AUDIO PROMPTS - Receive audio prompts from your connected smartphone that include laps and lap times SMART NOTIFICATIONS - See incoming email, text messages, call alerts, calendar reminders and more from your compatible smartphone - When paired with a compatible smartphone