1byone Easy Chime Premium Portable Waterproof Wireless Doorbell Kit, with CD Quality Sound, 36 Chime Tones and Adjustable Volume, Stable Wireless Transmitting Range – – Amazon.com
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Buy 1byone Easy Chime Plug-in Wireless Doorbell Operating at 500 feet, CD Quality Sound and LED Flash, 36 Melodies to Choose, White 4.4 out of 5 stars 474 $7.99  Prime Feedback Bestrix Smart Wireless Doorbell with Receiver…

• Easy Chime Design – The kit includes one battery chime and one bell for you to DIY easily.
• Long-Range – With an operating range of up to 100m / 300ft, it can work virtually anywhere in your home. Each 1byone door chime kit is guaranteed with reliable material and a long lifespan FCC, CE and RoHS compliant.
• Versatile Feature – 36 CD-quality sound tunes with adjustable volume from 25dB-100dB
• IP44 Rated Push Button – It is waterproof and is painstakingly made to withstand rain, wind and other environments.
• Self-Learning Design – A specially designed coding system will overcome possible interference from nearby wireless products.