Senbowe&trade; Portable IP55 Waterproof Wireless Doorbell Chime/Door Bell with 1 Remote Button, LED Indicator, 1000-feet Range, 52 Chimes, 4-Level Volume, No Batteries Required for Receiver Wireless doorbell range up to 1000 feet (300m) in open area that you will not miss any visitors, no matter where you are in door. Remote transmitter button is rated IP55 waterproof,suitable for undoor and outdoor Door bell widely used: compatible with home furnishing, office buildings, hotels, factories ,home and etc No electromagnetic radiation with our senbow wireless waterproof door bell, 52 different tones , 4 level adjustable volume, Built-in stereo speakers make the sound crisper and sweeter Easy Installation: plug the receiver into an electrical outlet. Mount transmitter through double-sided adhesive tape or included screws / anchors.IP55 Waterproof wireless doorbell 1 YEAR 100% SATISFACTION WARRANTY: Any problem,please do not hesitate to contact us. if you aren't pleased with them, simply let us know anytime and we'll promptly send you a full refundw No hassle and absolutely no risk on your part.