Advanced Self-Powered Technology: the hassle of battery replacements with our innovative self-powered doorbell. Harnessing energy from every , it ensures reliable performance without the need for batteries. Environmental Monitoring: Stay informed with the built-in display that shows temperature, humidity, and time. This feature helps you keep track of indoor conditions, making it more than just a doorbell. Long-Range Wireless Connectivity: Utilizing 433MHz frequency, the doorbell offers extensive coverage, reaching every corner of your home or office, ensuring you never miss a visitor. Easy Installation: Set up your doorbell in minutes with all the necessary tools provided. Its wireless design allows flexible placement outdoors or indoors without worrying about wiring. and Stylish: Designed to withstand weather conditions, making it perfect for outdoor installation. Its sleek, modern design complements any doorway. Voltage: AC85-265V Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on. Color: Black Material: Plastic+Metal Package Contents: 1 set x doorbell Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.