Umimile Wireless Doorbell, Self-Generating Power, No Batteries Required

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[38 Melodies and 4 Volume Levels with Light Notification] When the transmitter of this wireless chime is pressed, the receiver will emit a sound and both lights will flash to notify you. This doorbell offers 38 different melodies and 4 volume levels from 0-100DB. You can choose the appropriate volume according to your preferences and where you use it, making it very convenient.
[No Batteries Required & Easy Installation] The transmitter is self-generating, so it doesn't require batteries. It generates power only when the button is pressed, resulting in less frequent maintenance and replacement, and a long lifespan. Both double-sided tape and screws are included, allowing for easy installation without wiring. Simply plug the receiver into an outlet, and it can be used by children and the elderly.
[Waterproof and Dustproof] The transmitter of this doorbell features a waterproof and dustproof internal structure, making it safe for use in outdoor areas or bathrooms where water may be present. Even if rain or splashes directly hit the doorbell, the internal circuits and components will not be damaged and will function normally. This allows it to be used as a reliable notification device for a long time.
[Stable Reception & Memory Function] This doorbell uses a highly sensitive receiver that can receive signals stably through walls. It is suitable for indoor use as well as use in two-story homes. It also has a memory function that can record melodies, making it easy to use when changing locations without having to repeat setup.
[Expandable & Versatile] One transmitter can be connected to multiple receivers, and one receiver can also be connected to multiple transmitters. Transmitters and receivers can be combined arbitrarily, allowing for configurations like 2 transmitters to 2 receivers, or 3 transmitters to 2 receivers. It is highly versatile and can be used in various settings such as a doorbell for guests, for elder care, or for communication and calls in shops and offices. It is also recommended as a chime for the elderly, children, or people with disabilities.