Wireless Doorbells,55 Melodies 5-level Volume And,ip55 Waterproof,with 300 Meters,led Flash,plug-in-black Easy to install "Plug & Play" This wireless doorbell is easy to install and use. 55 Ringtones 55 ringtones for your choice easily customizable. To change ringtones, just press the plus or minus key to change, then press the volume key for 5 seconds and you're done. 5 Adjustable Volume 5 levels for adjustable volume (from " mute" at level 4). The distance between the receiver and the transmitter can be up to 300 meters. Wireless waterproof doorbell Convenient With wireless connection technology (connected by radio) and the IP55 waterproof level, it allows you to choose the location of the transmitter and receiver wherever you need. Durable With Low Power Consumption This IP55 waterproof doorbell operates between -30C and 70C (-22F and 158F), withstands various harsh weather conditions. The transmitter has extremely low power consumption; uses a 12V / 23A battery (included in the product).