My bicycle has a distance of 1m from the rear wheel to the handlebar, so the computer did not receive the radio waves transmitted from the sensor. I paid a repair shop 2000 yen to change it to a longer code. I installed a speed sensor away from the cadence sensor, and when the distance from the transmitter to the receiving computer was 85 cm, the computer started working. If it wasn't defective, I wouldn't have to pay 2000 yen for repairs.
If the signal is weak and the computer is mounted on the stem Can not be displayed. Wired type is better. It's a shame because my kid was expecting it.