High Quality: YAYALE wireless doorbell is made of ABS material, which is non-toxic, harmless and recyclable, the material can keep itself against from dust, rain and high temperature. It has no electromagnetic radiation, so it\'s perfectly safe for pregnant women. The levels of protection of remote transmitter button is rated IP55 weatherproof,Working properly from -22°F to 158°F. it can work perfectly outdoor. 55 Different Tunes: Our wireless doorbell is provided with 55 different ring tones with 5 levels adjustable volume from 25db- 110db. You can enjoy the tone music and set your favorite tones as you wish.the range of action is up to 1000ft/300m in the open area ensures you can hear the bell and answer the door or sign for the package in time. Security Guarantee:weatherproof and acceptable for outdoor use. Easily plug receiver into an electrical outlet (no batteries required for main receiver). CE, FCC, RoHS certified. Installation Method of Transmitter:wireless doorbell Stick on the wall or Nailed to the wall There are screws grooves in the back cover of the transmitter, the holes can be pushed through, and fixed to the wall with screws. 100% Service:Provide 12 months of repair service.If you are not satisfied with your wireless doorbell, just return it, we will replace it or refund your total purchase with no additional cost.