Size and Weight
Dimensions	42.5 x 28.4 x 9.1mm
Weight - Sensor Only	9.7g
Weight - Sensor + Band	19g
Materials
Band Material	Polyester fiber, nylon, spandex
Sensors
Optical Heart Rate Hardware	5 LED lights with 4 photodetectors
Fit
Arm Size	7.09-12.6 inches (18-32cm)
Wearing Position	Bicep
Connectivity
Wireless Connection	Bluetooth
Supported Devices	Bluetooth-compatible devices that receive heart rate data Supports simultaneous connection of 3 devices
Data Sync	Real-time heart rate data
Durability
Water Resistance	3 ATM
Working Temperature	-4°F to 122°F (-20°C to 50°C)
Storage Temperature	-4°F to 140°F (-20°C to 60°C)
Charging Temperature	32°F to 113°F (0°C to 45°C)
Battery
Activity Mode	38 hours
Standby Mode	80 days
Battery Capacity	55 mAh
Charging Time	Less than 2 hours
Charging Cable	USB Type-A Connects to the sensor using a magnetic interface

Coros