Welcome to our store! This is a wireless doorbell with 38 melodies and 3 volume levels. The button is designed to be IP44 waterproof. It has a wireless remote control range of 300m and is easy to use. The receiver supports 100-240V AC voltage and the transmitter requires a 12V23A battery (not included). The power specifications are EU. The application area is 300m and the wireless remote control distance is 300 meters in an open space using superheterodyne technology. The size of the receiver is approximately 95x65x24mm/3.74x2.55x0.94inch and the size of the transmitter is approximately 75x51x20mm/2.95x2.00x0.78inch. It consumes 1W of power and runs on 110V-220V. The material used is ABS + electronic components. The package includes 1 transmitter, 1 receiver, and 1 English user manual. 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We will do our best to provide you with satisfactory customer service.