1.Button is Waterproof ,Don"t worry about extended use2.The wireless doorbell offers a wide selection of 36 melodies and 4 volume levels to meet your needs for different occasions. Flashing light with audio alert indicators which is easy for people including the hearing impaired to notice.3.Operating range up to 1000ft / 300m in open area, ensures you to hear and answer the doorbell in time. You will never miss a visitor even if you are a few rooms away or on another floor4.Easy to install with the double side adhesive tape or the screws.5.The button has no screw chuck design, and it can be waterproof and dustproof without rubber ring.Works between -4 u00b0F to 140 u00b0F; withstands various harsh weather conditions6.The button supports up to 20PCS, and the receiver supports up to 100pcs.7.If multiple buttons are paired with one or more receivers in the same system, each button can be set to a different ringtone.8.Power-off memory function: Turn the power on again after power off, no need to re-adjust and lock the ringtone.9.Transmitter USE a 23A12V alkaline battery (not included battery).Receiver voltage: 110-220-240V.10.Easy to install.Just plug the receiver into power socket and attach the transmitter on door,you don`t even necessarily have to make holes or damage anything11.Please check the socket type before choosing the power plug. Our wireless doorbell receivers have EU/US/UK plugs to choose from12.Size:Transmitter 77*46*20mm,Receiver 90*56*20mm.NOTE:The button cannot be placed on an iron door because it will interfere with the signal.How to modify and lock music?Press and hold the volume button of the receiver before plugging in the power socket. Plug in the power socket until the light of the receiver lights up, release the volume button, press the music button to adjust to the favorite music ringtone, press and hold the volume button again until When the light is on, press the transmitter twice immediately and the music is locked successfully.How to pair signals?

Pairing method: press and hold the volume button on the receiver for about 5 seconds (the light is on), release the volume button, then press the button immediately, the signal is successfully paired.

Package Included:1 x Wireless Doorbell