Note:
Button battery included. Please feel free to contact us if you have any questions.
57 Different Ring Tones The wireless doorbell has 57 melody tones and 4 levels of adjustable volume up to 110db.
Memory Function Every time you turn on the doorbell, the music is the same melody as the last time you turned it off, no need to reset the previous settings.
IP55 Waterproof Design The rugged construction and waterproof design allow the doorbell to withstand all kinds of harsh weather conditions.
Up to 390ft/120m Transmission Range (in open area) The long transmission range ensures you will never miss a visitor, even if you are a few rooms away or on another floor.
Different Song Use for Different Mode
Easy to Installation Plug and Play design is convenient and quick.
Installation Steps: 1. Stick the double-sided tape on the back of the waterproof doorbell transmitter. 
It is enough to cover every door and window in your house.
s a CR2032 lithium battery that boasts 3-year maximum lifespan
2. Install the F15 outdoor waterproof wireless doorbell transmitter in the place you need.
3. Plug the M521 wireless doorbell receiver into main power.
