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 Intelligent sensing doorbell: built-in intelligent chip doorbell, effective sensing distance 4-6meters Easy installation: installation, tear off the sticker, doorbell can be installed in any position to meet your different needs This doorbell has 19 Chinese recordings and 1 English You can record and use it according to your own needs Wide applications: the induction doorbell is used in families, apartments, shops, supermarkets, as well as the elderly, patients, pregnant women and so on, Manufacturer: Mekalero