General description The Wireless Doorbell is a versatile and convenient solution for homes, offices, and various other premises. It features a long-range capability of up to 300 meters in open areas, ensuring you never miss a visitor. With a waterproof and dustproof design, this doorbell is perfect for outdoor use, even in rainy conditions. It offers 38 different ringtones and adjustable volume levels, making it suitable for various environments, including training dogs or quiet classrooms. Technical specifications Power Source: AC, Battery Power Supply: 110V-220V-240V Operating Frequency: 433MHz Waterproof: Yes Battery Mode: 12V 23A Battery (Battery Not Included) Receiving Distance: 300m (in open area) Volume Levels: 3 adjustable levels (0-85dB) Ringtones: 38 different melodies Transmitter Dimensions: 75 x 51 x 20 mm Receiver Dimensions: 95 x 65 x 24 mm Installation Plug the receiver into an outlet (no battery required for the main receiver). Attach the transmitter to the door frame