Walker xoss heart rate arm with bicycle running heart rate monitoring

Product Information:
Model: Arm Heart Rate Belt
Size: 46.48*34.58.11.58mm
Weight: 55G
Battery: Rechargeable lithium battery 90mAh
Battery life: 20 hours
Communication method: Bluetooth 4.0, ANT+
Chest heart rate belt: 66' 38* 11.7mm39g
Bluetooth: 4.0, ANT+
Wearing style: Wear on the elbow, above or below, in the vertical position of the middle of the chest
Packing:   Armband heart rate monitoring G+ code meter accessory x1