60 Melodies, 5 Levels of Volume Adjustable: The wireless doorbell offers 58 ringtones to choose from to suit your personal preference. 4 levels of volume from 20dB to 110dB. High-Performance Transmitter: Ultra-low power consumption; uses 23a12v alkaline batteries with a maximum service life of 2 years; IP44 dust and water resistance; Operating temperature range from -4°F-140°F, it can withstand all kinds of harsh weather condition. Long range up to 1000 feet (300 m) in open spaces: Make sure you never miss an important guest or urgent delivery even if you are a few rooms away. This wireless doorbell is suitable for kitchen, bedroom, living room, etc. EASY TO INSTALL: Simply plug the receiver into a wall outlet, install the button using the double-sided tape provided or screw it to the wall (screws included). DIY Scalability and Low Power Consumption: You can expand each transmitter up to 10 receivers. The code learning feature makes it easy to customize your doorbell with multiple transmitters and receivers. The transmitter is powered by a 23A 12V battery, which has been tested to ensure that the daily use pressure can reach 10,000 times without frequent battery replacement.