Huawei GT 2 LTN-B19 Guide De Démarrage Rapide page 48

Note:
Your device uses non-toxic materials which are not harmful to the
body.
Please consult a doctor immediately if you have an allergic reaction.
Leather straps are not water resistant.
Do not wear one during water-related activities. Consider a
fluroelastomer strap instead. 96725909_01