Intelligent sensing doorbell: built-in intelligent chip doorbell, effective sensing distance 4-6meters Volumes: large volumes sensing doorbell detects visitors will automatically prompt sound Weak / / strong three volumes adjustable; A variety of pleasing timbre can be switched at will This doorbell has 19 Chinese recordings and 1 English You can record and use it according to your own needs Easy installation: installation, tear off the sticker, doorbell can be installed in any position to meet your different needs Personalized: doorbell global voice and broadcasting, long press to open the function and input a specific sound This allows a specific tone to be sounded each for time the doorbell is activated, Manufacturer: NUEAYMS