Solution:
（1） When the sensor is attached to a surface with the adhesive sticker, please hold its housing and turn it counterclockwise to separate the housing from the bottom cover. Replace the CR2450 cell battery and install the new battery correctly.
（2）When the sensor is not attached to a surface with the adhesive sticker, use a coin to turn the bottom cover counterclockwise and open it to replace the cell battery.
（1） When the sensor is attached to a surface with the adhesive sticker, please hold its housing and turn it counterclockwise to separate the housing from the bottom cover. Replace the CR2450 cell battery and install the new battery correctly.
（2）When the sensor is not attached to a surface with the adhesive sticker, use a coin to turn the bottom cover counterclockwise and open it to replace the cell battery.