SURNICE Self-Powered Wireless Doorbell, No Battery Required Push Button, Waterproof Door Bell Chime Kit, up to 300m/1000ft Range with 38 Chimes, 4 Volume Levels & LED Flash, DIY Name Plate - Amazon.com
DIY Smart Doorbell for just $2, no soldering required » Frenck.dev
Wireless Doorbell Chime,Waterproof Plug in Door Bell Chime Kit Operating at 1300 feet,36 Chimes,DIY Name Plate Suitable for Home Office Classroom,White - Amazon.com
Wireless Doorbell For Your Home And Office | Electronics DIY Project
Wireless Doorbell,Waterproof Door Bell Chime Kit Operating 1300 feet with 36 Melodies, Name Plate For Home Office School,White (Battery Version) - Amazon.com