User's Manual

 Wear the bracelet
1) Wear the bracelet on your wrist. If you wear it all day long, you are suggested to
wear it at the place one finger wide below your ulna.
2) If you intend to accurately measure your heart rate by using any S1 bracelet, you
may shift the bracelet to your upper wrist, namely the place three fingers wide below
your ulna. The bottom heart rate sensor shall cling to your skin and movement shall be
avoided. Do not wear the bracelet too tight, otherwise blood circulation will be affected,
Ulna