Wireless design socket doorbell, you don\u2019t have to knock through the wall to install the electric doorbell. With glue on the back, just simply stick it on the wall, effortless. With a wide range of 150M, you won\u2019t miss any call; With adjustable 3-levels volume and optional 36 chimes, it\u2019s loud enough to be heard clearly in any corner of your home. Premium-grade IP54 material ensures its perfect performance in outdoor environment. Work great even being exposed in rain, snow or minus temperature weather.\nSelf-Powered Door Bell: Are you fed of of buying batteries for your old door bell? Aigostar self-powered door bell use the pressure from your finger pushing the button to generates electrical power itself and sends a stable signal to receiver, without the need for batteries. This is very cleverly designed, if you care to have less battery waste in your environment then this is for you.\n36 Ringtones & 3-Level Volume: Aigostar doorbell wireless has 35 different CD-qu.