Instant Alerts: Get immediate notifications to your phone through the app. Smart Security: Keep your home secure with a Next Gen Wi-Fi video doorbell. Motion Detection: Smart PIR sensor, two-way audio communication and 720p HD 1.7mm lens. Includes: Two rechargeable batteries and a charging pack. Energy Efficient: Low power consumption with up to 6-8 months usage. Remote Control: See who's at your door even when you're not at home. Smart Hd Wi-Fi Video Doorbell | Living Social