Long Range Signal: This waterproof wireless doorbell for outdoor use features 1 transmitter and 1 receiver. The penetrating wireless signal can be transmitted up to 300m in open space, even with obstacles like doors and walls. Never miss a visitor! Suitable for homes, apartments, villas, offices, shops, warehouses, hotels, factories, etc. 36 Melodies & 4 Volume Levels: Choose your favorite ringtone with the touch of a button, and adjust the volume to your liking with 4 adjustable levels. Waterproof Doorbell: The transmitter button is made of superior material and is waterproof, ensuring stable performance outdoors in all weather conditions. Easy Installation: Simply plug the portable receiver into any outlet and attach the transmitter to the wall with the included adhesive patch or screw. No batteries required for the receiver! LED Flash: A blue LED flash on both the button and receiver provides a visual signal for both the host and visitors, a thoughtful design for the hearing impaired. Long Range: The wireless signal can be transmitted up to 300 meters in an open space. Enrich your daily life with this convenient and reliable doorbell. Enjoy customizable volume levels to suit any situation.