1[Wireless Signal] The transmitter of our doorbell is connected to the receiver wirelessly, avoiding the trouble of wiring and making it more convenient to use. 2[58 Kinds Of Ringtones] Wireless doorbell has 58 kinds of optional ringtones, including ding dong and many kinds of music with adjustable volume. 3[IP55 Waterproof] This WiFi doorbell supports IP55 dustproof and waterproof, which can be used safely in rainy days and is suitable for various outdoor environments. 4[Multi Functional] Not only a doorbell, but also a pager, placed in the children, the elderly or pregnant women and other rooms that need care, single key to press. 5[Power Failure Memory] Pager doorbell with power failure memory function. Music IC with memory function, the tone and volume remain unchanged when the power is off.