Forerunner 45 is the GPS running watch with all the running-related features you need in a sleek, lightweight smartwatch you’ll want to wear all day and night. Garmin Coach - These adaptive training plans feature guidance from expert coaches and free training plans that adapt to you and your goals. Workouts sync right to your watch. Built-In Sports Apps - Switch up your workout routine with activity profiles for cycling, treadmill running, indoor track, elliptical, cardio, yoga and more. Wrist-Based Heart Rate - Get heart rate data1 along with alerts if your heart rate stays too high or too low while you’re at rest. Gauge how hard your heart is working during activities, even underwater. Built-In GPS - Track where you run, and get accurate stats, including distance, pace and intervals. Battery Life - Run to your heart’s content with up to 7 days of battery life in smartwatch mode and up to 13 hours in GPS mode. Stress Tracking - Find out if you’re having a calm, balanced or stressful day. Relax reminders will even prompt you to do a short breathing activity. Body Battery™ Energy Monitor - Track your body’s energy levels so you can find the best times for activity and rest. Fitness Tracking - While you’re out and about, Forerunner 45 tracks steps, intensity minutes and more. Smart Notifications - Receive emails, texts and alerts right on your watch when paired with a compatible smartphone. Safety And Tracking Features - If you feel unsafe or if your watch senses that an incident occurred, assistance and incident detection features3 send your location to emergency contacts. Connect IQ™ Store - Download custom watch faces, add data fields, and get apps and widgets from the Connect IQ Store. Music Controls - Easily control the music playing on your phone, so you can skip songs without missing a beat. Syncs With Garmin Connect™ - Upload your activities to the Garmin Connect app to interact with a thriving online community where people on the go can connect and compete — and even share their triumphs via social media. PHYSICAL SIZE: 42 x 42 x 11.4 mm - Fits wrists with a circumference of 129-197 mm. ISPLAY SIZE: 1.04" (26.3 mm) diameter. DISPLAY RESOLUTION: 208 x 208 pixels. DISPLAY TYPE: sunlight-visible, transflective memory-in-pixel (MIP). WEIGHT: Small: 32 g, Large: 36 g. BATTERY LIFE: Smartwatch Mode: Up to 7 days - GPS mode: Up to 13 hours. WATER RATING: 5 ATM. SMARTPHONE COMPATIBILITY: iPhone®, Android™.