Yet Plus. Ding Dong Doorbell. Mechanical Striking Wired Doorbell. Elegant design, easy to install, Ding Dong sound, energy saving. Features: 1. Simple and easy to install with its wired design. 2. Boasts low power consumption. 3. Perfect for various settings such as homes, offices, factories, and hotel guest rooms, also great for message notifications and alarms for patients and the elderly. 4. Features a mechanical striking function for Ding Dong sound effect.