SURFOU Doorbell,Waterproof Wireless Doorbell Operated at 1300ft/400m Long Range Door Bell with 55 Chimes 5 Adjustable Volume Levels and LED Flash Indicator Doorbell Kit for Home Classroom

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Ft/400 M RADIO WIRELESS COVERAGE: the strong and stable wireless signal anti-interference with other devices in your or your neighbours' home, ensure that you're never to miss a visitor, even if you're a few rooms away or on another floor
55 CLEAR SOUNDS TO SELECT: The plug-in receiver offers rich and clear sound; 5 adjustable volume levels with a maximum volume of 110 dB; Different 55 melodies to meet various needs, the default is Ding Dong
HIGH-PERFORMANCE TRANSMITTER: Ultra-low power consumption; the bell button operates 12V 23A batteries, which have up to a 3-year lifespan. IP55 dust and water protection level, operates in temperatures between -30 °C to 70 °C ensure it can withstand the harshest weather conditions
EASY TO INSTALL & EXPANDABLE: wireless bell set can be easily installed by attaching the bell button to a wall without wiring; You could install it anywhere inside, for home, garden, office, store, mailbox etc.
MEMORY FUNCTION & WARRANTY: The doorbell wireless set remembers your last selected melody and set volume level even after a power failure; you do not need to reset your previous settings. Free lifetime technical support and If you have any questions, please feel free to contact us, we will reply within 24 hours.