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[150 Meters Open Range] The distance between the transmitter and receiver is up to 150 meters. The transmission type is 433MHz, enough radio range to install the wireless doorbell anywhere in your home, ensuring you don't miss any visitors or packages. [36 Ringtones & 4 Volume Levels] You can choose your favorite ringtone from 36 different melodies…. All beautiful!. Possibility of adjusting the volume to 4 levels. [With Flashing Red LED] When the doorbell button is pressed, in addition to the ringtone, a red LED will flash on the receiver, making it highly visible, especially in the dark. This is also convenient for people with hearing problems or if the TV is on! [Easy Installation] Simply plug the receiver into an electrical outlet (indoor use only). The doorbell can be attached to the door frame with screws or secured with double-sided tape. In addition to the convenient name tag, the doorbell also has a red light that lets visitors know their call is being received. Finally, the doorbell is splash-proof, making it suitable for use on a gatepost or under a porch. [No Interference] Pairing the doorbell and receiver is very simple and requires no expertise. Above all, this pairing ensures there will be no frequency interference with other wireless devices nearby.