Long Signal Range: Penetrating wireless signal can be transmitted up to 280m in open space and long distance even with many obstacles (doors, walls)  Designed for Exterior: Superior material wireless transmitter is waterproof to IP44 standard, stable performance is guaranteed for outdoor use Blue LED on button and receiver is a visual indication for guest and visitor, it is also a fun and thoughtful design for the hard of hearing 36 Melodies in CD quality are yours to choose from by pressing the button on the receiver, with 4 adjustable volume levels 25dB-85dB  Simple Installation: 2 steps. Connect the portable receiver to any sector, and stick the transmitter on the wall with the patch or screw provided. The receiver does not require a battery. Unplug the receiver to stop the chime ringing Waterproof, anti-interference, anti-roping, 300m acceptance distance, bring you a better and more convenient life.