Easy To Install "Plug & Play": This Wireless Doorbell Is Easy To Install And Use, All You Have To Do Is Plug The Receiver Into A Home Wall Outlet And Install The Transmitter Box The Exterior With The Included 3M Double-Sided Tape. Installation Completes Within 3 Minutes No Need To Pull A String, Drill Your Wall 55 Ringtones: 55 Ringtones For Your Choice Easily Customizable. To Change Ringtones, Just Press The Plus Or Minus Key To Change, Then Press The Volume Key For 5 Seconds And You'Re Done. No More Old-Fashioned Ringtones 5 Adjustable Volume: 5 Levels For Adjustable Volume (From "Mute" To Level 4), Choose The Volume You Need For The Time, Such As Low Volume For Avoid Waking Everyone In The Morning Or Disturbing Baby'S Sleep, High Volume, If You Live On The Second Floor Or For A Large Place. The Distance Between The Receiver And The Transmitter Can Be Up To 300 Meters. Wireless Waterproof Doorbell Convenient: With Wireless Connection Technology (Connected By Radio) And Ip55 Waterproof Level, It Allows You To Choose The Location Of Transmitter And Receiver Wherever You Need, Such As Front Door, Workshop, Apartment, Old House, Dormitory, Mailbox, Office, Etc It Is Also A Very Ideal Replacement For The Traditional Bell That Has Failed And An Alarm For Elderly Patients And Nurses. Durable With Low Power Consumption: This Ip55 Waterproof Doorbell Works Between -30 C And 70 C (-22 F And 158 F), Withstands Various Harsh Weather Conditions. The Transmitter Has Extremely Low Power Consumption; Uses A 12V / 23A Battery (Included In The Product) With A Maximum Lifespan Of 3 Years. ,"