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. Remote Control: See who's at your door even when you're not at home. Includes: Two rechargeable batteries and a charging pack. Instant Alerts: Get immediate notifications to your phone through the app. Energy Efficient: Low power consumption with up to 6-8 months usage. Smart Hd Wifi Security Doorbell With Batteries + Recharge Pack | Living Social