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). About shlpping: All items will be shlpped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping Thanks for your cooperation and we'll make you feel satisfied.