This is a wireless chime that can be installed without any wiring. You can change the volume and sound type with the site button. To cancel, simply press the receive button. Requires 3 AA batteries (sold separately). It can connect the bathroom door and living room, making it convenient when bathing a baby. 60 different sounds 4 volume levels Notifies with sound and light Intercom, entrance, nursing care, childcare, 60 melodies, store, nurse call, meal call, battery-powered