Operating time: Up to 5 days of use on a single charge

Battery type: 148 mAh Li-pol rechargeable battery

Case material: Plastic (ABS+GF, PMMA) + Stainless steel SUS 316 (Stainless steel)

Strap material: Fabric (57% Polyamide, 27% Elastane, 20% Polyethylene)

Sensor width: 25 mm (1.0 inch)

Sensor height: 42 mm (1.7 inches)

Sensor thickness: 9 mm (0.4 inches)

Strap size: 22 - 34 cm / 13.4 - 8.7 inches (circumference)

Total weight: 21 g (0.75 oz)

Total weight without armband strap: 9 g (0.32 oz)

Bluetooth version: BLE ANT version 2.0

Operation temperature min: -10 °C (14 °F)

Operation temperature max: 50 °C (120 °F)

Water resistance: To 30m depth (100 ft)

Optical HR: yes

Accelerometer: yes