Alatech Optical Heart Rate Armband
FEATURES
Dual mode technology
Compatible with Sport watch /Cycling computer/Fitness equipment and Smart device with Bluetooth 4.0, ANT+; also work with most Bluetooth Smart Fitness Apps.
Storage function
The built-in memory can independently record and store heart rate data and SPM (steps per minutes); no need to bring the smartphone or wear the watch
when exercising. After exercising, the user can
synchronize the data to Ala Connect through Bluetooth to review the training overview.
Lightweight and comfortable
The sensor and armband are less than 20 grams; can be worn on the forearm orupper arm.
Specifications
Dimension: L48×W31.5×D12.5mm
Armband: L380×W25mm
Weight: 13 g (armband excluded)
IP rating: IPX7
Memory capacity: Up to 25 hours training. (Single recording file up to 13 hours)
Operating temperature: -10~60°C (-14~140°F)
Charge temperature: 10~45°C (50~113°F)
Wireless transmission interface: Bluetooth 4.0, ANT+
Wireless transmission frequency: 2.402~2.480 GHz
Battery: rechargeable lithium battery
Input voltage: 5V
Run time: 40 consecutive hours (max.)

https://youtu.be/HlStQzAyYDs