LED Indicator: The plug-in doorbell receiver features a 7-color LED light indicator that flashes when the transmitter is pressed and a signal is received. This feature serves as a visual alert for those with impaired hearing or when you prefer to have a silent doorbell experience. You can mute the wireless waterproof doorbell and rely on the LED indicator to notify you when someone is at the door and push the button. Waterproof & Durable: With its waterproof rating, this cordless doorbell kit is designed to withstand harsh weather conditions ranging from -4 F to 140 F. Its ultra-low power consumption. Easy to Install and Set Up: Installing this battery operated doorbell kit is simple. Just plug the receiver into a power outlet and attach the transmitter to your exterior wall using the provided screws or adhesive patch. you can set up multiple doorbell transmitters behind the front door, and you can also add additional receivers in different locations so that you can hear the doorbell chime from anywhere.