Wireless Doorbell Home Security Alarm / Welcome Smart Doorbell Three In One Multi-function Door Button 433MHz Easy To Install Features: 1. The Product Can Accept Long Distance, Loud Sound, Strong Penetrating Power, Good Home Furnishing 2. The Product Has 58 Built-In Chord Music, Select The Music According To Personal Hobbies 3. Four-Level Volume Adjustment, The Sound Level Can Be Adjusted According To The Environment, Or It Can Be Adjusted To Mute 4. Suitable For Many Occasions, Small Apartments, Office Buildings, Can Be Used As A Pager For The Elderly, A Little Helper To Get Up, Multi-Functional And Multi-Scene 5. Waterproof Design, Not Afraid Of Rainy Days Product Parameters: Product Category: Smart Wireless Doorbell Product Model: W-101 Material: ABS Product Weight: 140g Music Selection: 58 Chord Music (4 Levels Of Volume, Including Mute) Color Options: White Product Size: Transmitter Size: 3.1 x 7.2 x 2cm/1.22x2.83x0.78in Receiver Size: 6 x 9 x 6.8cm/2.36x3.54x2.67in Packing List: Doorbell Receiver x 1 Doorbell Transmitter x 1 Manual x 1 Kiplyki Wireless Doorbell Home Security Alarm / Welcome Smart Doorbell Three In One Waterproof Doorbell 1. The Product Can Accept Long Distance, Loud Sound, Strong Penetrating Power, Good Home Furnishing 2. The Product Has 58 Built-In Chord Music, Select The Music According To Personal Hobbies 3. Four-Level Volume Adjustment, The Sound Level Can Be Adjusted According To The Environment, Or It Can Be Adjusted To Mute 4. Suitable For Many Occasions, Small Apartments, Office Buildings, Can Be Used As A Pager For The Elderly, A Little Helper To Get Up, Multi-Functional And Multi-Scene