A-rival Teasi Core Guide De Démarrage Rapide page 21

If your Teasi Core cannot be found, use the Reset arrow to update the
status of the search.
3. Using Bluetooth Sensors
3.1 Speed/Cadence Sensor
a) There is a CR2032 button cell inside the product to provide power
and its service life is 4 months in general. Teasi Core or Tahuna will
fail to detect sensors when sensor cell is dead or sensor is
damaged. Sensor cell can be replaced according to the figure
below.
Please note: when you use this product for the first time, please
remove the battery hatch to remove the insulation film.
b) This product can be connected to any equipment conforming to
BLE 4.0 standard protocol and transmit data to it.
c) This product will get into sleep mode after wheels stop spinning for
5 min in order to save power; it will also get into sleep mode when
App or Teasi Core disconnects with sensor. When it is used again,
bike wheels shall be made spun to activate sensor, so that the
product can be searched by App or Teasi Core.
4. Teasi Core has 2 working modes:
a) Bike computer working mode:
Teasi Core is only a bike computer that is not connected to App in
this mode, speed/cadence sensor and HR monitor shall pair with
Teasi Core and connect to it.