Long Signal Range:The wireless signal can be transmitted up to 280m in open space and long distance even with many obstacles (doors, walls)Simple Installation:Get the wireless doorbell up and running in minutes, no wiring required, absolutely hassle-free. You can stick the transmitter or screw it onto the wall by drilling, plug the receiver into any electrical outlet and the connectionis done instantly.36 Melodies Available:The doorbell comes with a large amount of ringtones, whether original songs or classics, to choose your favorite. With 4 adjustable volume levels 25dB-85dB (loud enough even if the TV is on), you can loweror increase the volume as needed.Waterproof IP44 Transmitter:The wireless transmitter made of superior material is IP44 waterproof, stable performance is guaranteed for outdoor use.User-Friendly Design:The doorbell button also has a blue LED that lights up when someone has successfully rung the bell, which is useful for those who are hard of hearing or if you are vacuuming.Notes for use:Remove the battery if you will not use the doorbell for a long time.Do not install the doorbell on a metal door, or the transmitter signal will be interfered with.Please do not install the door at the place of exposure under the sun and rain directly, or the transmitter's lifespan may be shortened.Package includes:1 X Transmitter (battery included)1 X Receiver1 X Instructions for use1 X Accessories for installation