wireless doorbell, avantek d-3b waterproof door chime kit operating at over 1300 feet with 2 plug-in receivers, 52 melodies, cd quality sound and led flash avantek with superior performance and ultra-low power consumption, the avantek d-3b wireless doorbell stands out among other doorbells. it is the easiest and most convenient choice for homes, office buildings, hotels and more. <br> <br> <b>durable and waterproof transmitter</b> <br> <br>the built-in 230 mah cr2032 lithium battery has an ultra long three year lifespan, saving you the annoyance of frequently buying and replacing batteries for your doorbell. the impressive ip55 dustproof and waterproof rating makes the transmitter tough enough to withstand various outdoor environments. what’s more, with a working temperature ranging from -4 °f-140 °f, the transmitter can work for you in even the harshest weather conditions. <br> <br> <b>various pleasant chimes</b> <br> <br>a wide selection of 52 melodies allows you to easily choose one to suit your preferences. you will never get bored with your doorbell again! it is easy and simple to choose your favorite melody with the use of the next and previous buttons. in addition, the built-in 40 mm stereo speaker delivers clear and well-balanced sounds that are sure to please you. <br> <br> <b>long operating distance</b> <br> <br>the doorbell supports an extensive 1312-foot working range (depending on the operating environment). rest assured that you’ll never miss any important guests or urgent deliveries with the help of the doorbell. <br> <br> <b>innovative memory function</b> <br> <br>one of the great advantages of the avantek doorbell is its memory function. every time you turn on the device after a power outage, it will still maintain your last set melody and volume level. this makes it not only extremely convenient, but also very user-friendly. <br> <br> <b>note: metal will interfere with the signal and shorten the transmission range. please place the transmitter in areas away from metals.</b>