Wireless Smart Home Doorbell Digital circuit design does not cause crosstalk or bad ringing 300 meters in a straight line in the ground 5 freely adjustable volume levels 60 songs to change as you wish easy installation of a Plug and Play device Long distance barrier-free penetration of 300 meters The penetration performance is strong, the receiving distance can be up to 300 meters from air to ground.Note: The actual receiving signal varies with the environment, and the signal is different due to different obstacles. Anti-interference and no crosstalk Digital circuit design, multiple sets of use without crosstalk, effectively avoiding the problems caused by mutual interference between neighbors The receiver can be installed indoors and plugged in A bell rings in the room when as you press the button The receiver supports AC voltage 100-240V The transmitter is installed outside the door The package includes : 1 * smart doorbell (transmitter + receiver) 1. Manual measurement, there will be some errors in the size, please refer to the actual size 2. Due to the light and screen difference, the product's color may be slightly different from the picture.