Features: Intelligent sensing doorbell: built-in intelligent chip doorbell, effective sensing distance 4-6 meters. Volume adjustment: large volume sensing doorbell detects visitors will automatically prompt sound. Weak/medium/strong three level volume adjustable; A variety of pleasing timbre can be switched at will. Personalized recording: doorbell support global voice recording and broadcasting, long press to open the recording mode and input a specific sound. This allows a specific tone to be sounded each for time the doorbell is activated. Easy installation: magnetic installation, perforation-free installation, gum doorbell, tear off the sticker, doorbell can be installed in any position to meet your different needs. Wide range of applications: the induction doorbell is used in families, apartments, shops, supermarkets, as well as the elderly, patients, pregnant women and so on. Package Includes: 1x Doorbell Specifications: Material: Plastic Size: Approx.5.2x3.7x8.5cm/2.04x1.45x3.35in Color: White note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.