Extra remote Transmitter button for the expandable wireless Doorbell alert system (White)

Great purchase with easy installation and fun options of ring sounds. Grandkids love ringing our doorbell for the Lone Ranger sounds

My brother bought this door bell for my parents in March 2018 worked fine until November 2018 it's useless... I thought maybe battery is dead so I replaced with brand new battery and still not working. Before that it randomly rang day and night.