Ayce TRUE BALCK 1.0 Manuel D'utilisation page 124

To avoid the wireless sensor and main unit pairing fail,
please power up thesensor(s) first, and then press
[ RESET ] key in main unit after sensor setup.
You may not receive the signal immediately.
Due to the atmospheric disturbance, the best
reception often occurs during night time.
WIRELESS SENSOR SIGNALRECEIVING
1. In normal mode, press [ SENSOR ] key to pair the
sensor of current displaying channel.
2. The signal icon will flash until the reception
succeeded. If no signal is received within 5 minutes
the icon will disappear.
Receiving wireless signal after manual
reset or the [ SENSOR ] key is pressed
When no sensor signal received, "--"
will display in the readings field
Good wireless sensor signal received
GB