Specifications Physical & Performance Physical Dimensions: 1.41" x 1.73" x 0.55" (35.9 x 43.9 x 13.9 mm) Display Size, WxH: 0.73" x 0.73" (18.5 x 18.5 mm) Display Resolution, WxH: 128 x 128 pixels Weight: 31 g (1.1 oz) Battery: Rechargeable lithium-ion Battery Life: Small: 8 weeks, watch mode; 8 hours in training mode Water Rating: 5 ATM GPS-Enabled High-Sensitivity Receiver Maps & Memory History: 7 activities Running Features Virtual Pacer (compares current pace to target) Accelerometer (calculates distance for indoor workouts, without need for a foot pod) Personal records Performance Features Heart Rate Monitor: Yes (Some versions) Foot Pod: Yes (optional) Auto Pause (pauses and resumes timer based on speed) Auto Lap (automatically starts a new lap) Time/Distance Alert (triggers alarm when you reach goal) Heart Rate-Based Calorie Computation Calculates Calories Burned Customizable Screen(s) Shock Resistant Activity Tracking Features Step Counter Auto Goal (learns your activity level and assigns a daily step goal) Move Bar (displays on device after a period of inactivity; walk for a couple of minutes to reset it) Sleep Monitoring (monitors total sleep and periods of movement or restful sleep) Garmin Connect Garmin Connect Compatible (online community where you analyze, categorize and share data) Automatic Sync (automatically transfers data to your computer) Additional BLE transfers to Garmin Connect Mobile Smart notifications Time, distance, and calories alerts as well as heart rate and run/walk alerts