Long Range SignalThis outdoor waterproof wireless doorbell has 1 transmitter and 1 receiver, the penetrating wireless signal can be transmitted up to 300m in open space and long distance even with many obstacles (doors , walls).Don't worry about missing visitors. Suitable for home, apartments, villas, offices, stores, warehouses, hotels, factories, etc. 36 Melodies and 4-Volume Levelsquality of are your choice by pressing the button on the receiver, with 4 levels of adjustable volumes Waterproof DoorbellThe transmitter button made of superior material is standard waterproof and stable performance is guaranteed for outdoor use, no worry for all weather conditions. Easy Installation2 steps Connect the portable receiver to any mains, and stick the transmitter on the wall with patch or screw provided. The receiver does not require a battery. Unplug the receiver so that the chime no longer sounds. LED FlashBlue LED Flash at the button and receiver is a visual cue for host and visitor, it's also a fun and thoughtful design for the hearing impaired, as it lights up when in use. > 300 meter long beach Waterproof outdoor wireless doorbell signal can be transmitted up to 300 meters in open space. Connect the receiver in a room at the bottom of the first floor, press the button of the transmitter on the ground floor, the two respond to each other verywell even with spaces, walls, doors between them. The waterproof outdoor wireless doorbell enriches your daily life by entertaining you and your children. There are 4 volume levels available, you can adjust according to circumstances.