Product information:

Material: Acrylic
Specification: black

Battery type: rechargeable battery - lithium battery
Operation time: continuous exercise can exceed 10 hours
Operating temperature: 0'C to 50'C (32'F to 122'F)
Transmission system: Bluebud 4.0 and ANT+(both supported);
Waterproof grade: IP68

Packing list:

Heart rate arm band *+USB charging cable+Band (37 cm)+an instruction manual