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Reviews

Product
Product nameForerunner 645
Product properties
Type
Sport Watch
Type of GlassGorilla Glass
Case MaterialStainless Steel
Strap MaterialSilicone
Weight42 g
Resolution240x240
Display Size1.2 "
Available Watch ColoursSilver
Available Strap ColoursBlack
FitsUnisex
Waterproof (depth)
50 m
Sensors
Barometric Altimeter, Thermometer, Glonass, Accelerometer, GPS, Compass
Smart FeaturesFind My Watch, Phone Notifications, Weather, Find My Phone
Smartphone compatibilityiPhone, Android
Mobile App CompatibilityGarmin Connect
Wireless TechnologyWi-Fi, Bluetooth Smart, ANT+
Diameter30.4 mm
Other PropertiesBluetooth, Heart-rate Monitor, Alarm, Customizable Data Pages, Stopwatch, Colour Display, Clock, Date, GPS Timekeeping
Pulse
Wrist-based Heart RateYes
Supporting Heart Rate SensorYes
Pulse FeaturesHR Broadcast, Recovery Time
Activity Tracking
Step CounterYes
Calories BurnedYes
Sleep MonitoringYes
Auto Step GoalYes
Floor ClimbedYes
Inactivity WarningYes
DistanceYes
Training
SportsBiking, Climbing, Snowboarding, Running, Rowing, Swimming, Fitness
Online Sports Forum
Strava
Other Training FeaturesSpeed, Audio Prompts, Training Effect (aerobic), Manual Lap, Auto Lap, Virtual Partner, Training Status, Training Effect (anaerob), Auto Pause, Distance, Activity History, Interval
Battery
Battery Time (watch mode)7.0 Days
Battery Time (GPS/training mode)12.0 h