Smart Doorbell Battery-Operated Waterproof led Light Home Cordless Calling Bell 48 6 Volume (Color : OneColor)

Press the button, super learning code can freely learn to match, can be unlimited matching receiver and button.
The transmitter without screw chuck design to achieve waterproof and dustproof.
The transmitter USE a 23A12V alkaline battery (not included battery).
The receiver uses 3 AA alkaline batteries, no need to plug in the power supply, and the battery can be used.(not include battery).
Receiving distance:300 meters in opening area.

The signal will be affected by obstacles. The more obstacles, the more serious the signal loss.
Receiver has 6 levels(can be mute) 0-80db,48 music to choose from.
Transmitter size:79*45*22mm
Receiver size:110*57*25mm
Just plug the receiver into an electrical outlet,the push button transmitter can be stick it to the door with provided adhesive tapes.

Note:
The button cannot be placed on an iron door because it will interfere with the signal.
The ringtone and volume can be adjusted to meet your original needs.
Press the button, super learning code can freely learn to match, can be unlimited matching receiver and button.
The transmitter without screw chuck design to achieve waterproof and dustproof.
The transmitter USE a 23A12V alkaline battery (not included battery).
The receiver uses 3 AA alkaline batteries, no need to plug in the power supply, and the battery can be used.(not include battery).
Receiving distance:300 meters in opening area.
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