【60 Melodies with 5-Level Adjustable Volume】The wireless doorbell offers a wide selection of 60 chimes for your personal taste. 4-level of volume works from 20 dB to 110 dB. You can change the volume and even silence it and only have it light up. 【Over 1000ft operation range in open space】No matter you're upstairs, in the garden or at the back door, just keep a receiver at a place near you, alert sound will catch your attention successfully. This wireless doorbell works perfectly in the kitchen, bedroom, living room and so on. 【Super easy to install】Wireless plug-in doorbells. Door bell without any hard wiring/electrical/drilling. Just plug and play. Simply plug the main doorbell chime into a wall outlet, install the push button with provided double sided tape or screws. 【Distinguish front and rear doors】You can program each button to a different tone so you know where your guests are. This is a very convenient feature for multiple doorway entries. 【Package includes】2 x Button, 1 x Receiver, 1 x Instructions