Notice: 1.Please put the doorbell close to the chime during pairing process. 2.Please ensure the doorbell is not out of power during pairing process. 3.The indicator light of the chime go out when pairing success. 4 If you don't do pairing step 3 after done pairing step 2, the chime's indicator light will go out as well after 10 seconds and the pairing will fail. 5. Ploase reset the doorbell and try again if pairing failed.