**********WRIST BASED HEART RATE - Forerunner 235 utilizes s very own wrist based heart rate sensor that tracks 24/7*****LARGER SCREEN - A 44% larger screen than the 225 but the same physical size*****BATTERY LIFE - 12 weeks in watch mode and 12 hours in training mode*****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