Description: Wireless Doorbell: This doorbell don't require any wiring, long wireless receiving range up to 300m/984.25 feet, ensures that you will never miss any visitors. Great for the elderly or the people with hearing disabilities. Adjustable Volume: The long range wireless doorbell has 55 chimes to choose and 5 levels adjustable volume (0-100dB) to meet your needs in different occasions. With silent do not disturb mode, only flash, giving users a better home experience. IP55 Waterproof: The door bell can work in temperature ranges from -22°F to 158°F, weatherproof, waterproof and dustproof. Suitable for home, office, business, apartments, garage, classroom, etc. Battery Operated: The Transmitter is powered by a 12V 23A alkaline zinc manganese battery (Included), the doorbell is powered by 3x AAA batteries ( Not Included ), long battery life and energy saving. Installation: Easy to install, self adhesive & wall mounted 2 installation methods for your choice. Specification: Product Size: Transmitter: 3.5x8.5x1.5cm/1.38x3.35x0.59inch Receiver: 8.2x8.2x3.1cm/3.23x3.23x1.22inch Material: plastic Waterproof grade: IP55 Operating temperature: -30°C to +70°C Working frequency: 433.92MHz±280KHz Receiver voltage: 110-260V/50-60Hz (wide voltage) Transmitter battery: 12V 23A alkaline zinc manganese battery (included) Doorbell battery: 3x AAA (not included) Power consumption: 0.2W Package Includes: 1 Piece Receiver 1 Piece Transmitter 4 Pieces Fixing Screws 1 Piece Double Sided Adhesive Tape 1 Piece Screwdriver 1 Piece Manual Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!