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 at your choice by pressing the button on the receiver, with 4 levels of adjustable volumes Waterproof DoorbellTransmitter 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 Plug the portable receiver into any mains, and stick the transmitter on the wall with provided patch or screw. The receiver does not require a battery. Unplug the receiver to stop the chime ringing. LED FlashBlue LED Flash on the button and receiver is a visual cue for host and visitor, it is also a fun and thoughtful design for the hearing impaired , as it lights up when in use. Long range of 300 meters Waterproof outdoor wireless doorbell signal can be transmitted up to 300 meters in an open space. Connect the receiver in a room at the back of the first floor, press the button on the transmitter on the ground floor, the two respond very well 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.