Why choose our video doorbell? 1. All-weather operation, two-way voice call 2. Power supply required: AC (16v-24v), USB (5v 2a) 3. Wireless network connection 4. 1080p true HD 5. Siren support 6. Adjustable doorbell volume 7. Outdoor waterproof 8. Optional Alexa/Google Home function (activation requires additional fee!) * Why do you need our video doorbell camera? Is it for home security, important visitors, courier visits, strangers, etc.? * This wireless doorbell camera is the best choice for your home security protection.