Two doorbells and one button, wireless doorbell, 39 ringtones, waterproof doorbell, range of 150 meters, 8 volume levels.

【Ultra-Reliable Long Range】 - Reliable wireless coverage avoids interference with your household appliances, ensuring you never miss a visitor or package. 【Weatherproof Doorbell, Easy Installation】 - IP55 weatherproof doorbell with a modern design and simple operation. Easy, no-wiring installation. Simply attach the included button and door panel to the exterior wall, then plug the doorbell receiver into an electrical outlet. 【Multiple Ringtones & 5 Adjustable Volume Levels】 - Choose from 58 ringtones and enjoy 8 adjustable volume levels for clear sound even from other rooms or floors. 【Loud Doorbell with Flashing LED Indicator】 - Powerful 110dB doorbell with a flashing LED indicator, designed for the hearing impaired and the elderly. Of course, it can also be put into silent mode if you don't want to be disturbed. 【Expandable and Multifunctional】 - This wireless doorbell system can be expanded by adding receivers or buttons of the same model. Multiple doorbells can be configured as separate doorbells to easily differentiate between the location of visitors at the front and back doors.