When you are happy with the way it’s lined up, squeeze it onto the face all at once! The sticker (made
of vinyl) will kind of stretch over the sensor and give it a nice close fit. If you get a wrinkle, don’t worry, just
press it down really hard and it should stick. We gave you 4, so you can replace it if necessary.
That takes care of the front side. The vinyl sticker offers very good protection for the underlying circuit,
and we rate it ‘water resistant’. meaning: it can stand to get splashed on, but don’t throw it in the pool!
If this is your first time working with Pulse Sensor, you’re probably eager to get started, and not sure if
you want to use the ear-clip or finger-strap (or other thing). The back of the Pulse Sensor has even more
exposed contacts than the front, so you need to make sure that you don’t let it touch anything conductive or
wet.