Display
Display type: Digital
Display resolution: 260 x 260 pixels
Touchscreen: Yes
Display diagonal: 3.3 cm (1.3)
Display technology: MIP
Always-on display: Yes
Colour display: Yes
Display diameter: 3.3 cm
Watch glass type: Corning Gorilla Glass 3

Design
Market positioning: Sport watch
Watch case size: 46 mm
Watch case colour: Grey
Watch case material: Carbon Fibre Reinforced Polymer (CFRP)
Band colour: Grey
Band material: Silicone
Band size: One Size
Shape: Round
Lens material: Glass
Wrist size range: 130 - 205 mm
Buckle colour: Black
Waterproof: Yes
Closure type: Single prong strap buckle
Protection features: Water resistant, Waterproof
Removable strap: Yes
Water resistance: 5 ATM

Performance
Built-in microphone: No
Built-in speaker(s): Yes
Built-in camera: No
FM radio: No
Flash memory: 4 GB

Features
Heart rate monitor: Yes
Heart rate contact sensors: Yes
Heart rate sensor type: Optical
Heart rate measuring: Automatic
Blood oxygen sensor: Yes
Distance travelled: Yes
Pedometer: Yes
Calories burned: Yes
Accelerometer: Yes
Gyroscope: Yes
Activity tracker: Yes
Multisport mode: Yes
Personal goals: Yes
Quality of sleep: Yes
Clock mode: 12h/24h
Smart notifications: Yes
Weather display: Yes
Calendar notifications: Yes
SMS notifications: Yes
Timer: Yes
Electronic compass: Yes
Music player: Yes
Audible alarm(s): Yes
Barometric altimeter: Yes
Alarm clock: Yes
Calendar: Yes
Stopwatch: Yes
Time/distance alert: No
Interval training: Yes
Heart rate-based calorie computation: Yes
Advanced workouts: Yes
Weather forecast: Yes
Heart rate data transfer: Bluetooth/ANT+
Automatic daily activity detection: Yes
Recommended activity: Climbing, Cycling, Diving, Fitness, Golf, Running, Swimming
Activity monitoring: Yes
Music control: Yes
Virtual partner function: Yes
Call notifications: Yes
Barometer: Yes
Thermometer: Yes

Network
Mobile network connection: No
ANT+ enabled: Yes
GPS (satellite): Yes
GLONASS: Yes
Galileo: Yes

Ports & interfaces
USB port: No
Wi-Fi: Yes
Near Field Communication (NFC): No
Headphone connectivity: Bluetooth
Bluetooth: Yes

Power
Battery life (max): 30 h
Battery life: 14 day(s)
Standby time (Bluetooth off): 25 h
Battery life (GPS mode): 16 h

Weight & dimensions
Width: 45.6 mm
Depth: 45.6 mm
Thickness: 1.29 cm
Weight: 49 g

Smartwatch Forerunner 255 Cinzento - Garmin