If someone lent you his sensor without unpairing his sensor with his account. No worries! You can do it by yourself. Follow these steps:
1- Turn on the sensor and switch on your bluetooth.
2- If you try to pair the sensor with your smartphone, you should have the following error message : "This sensor is already paired with another user, please ask him to unpair from his application first, and try again"
3- Then, press quickly 5 times the ON/OFF button of the sensor (220.127.116.11.5). The blue led should be flashing faster a few times.
4- Try to pair your sensor again. It should allow to pair the sensor to your account now!
Any other question? Contact your support center listed on the contact page!