iSmart Wireless Outdoor HD960P WiFi Doorbell Camera Smartphone CCTV Security Surveillance 2 way Audio Night Vision and Lifetime Cloud Storage Service No Monthly Fee Works with  Alexa 960P TRUE HD EXCELLENT VIDEO QUALITY WITH NIGHT VISION - Dophigo Smart Wi-Fi Camera Doorbell Lets you see, hear and speak to visitors from your smartphone anytime and anywhere. LIFE-TIME CLOUD STORAGE -No Monthly Fee . No Worry About Losing Video Stored on Cameras SD card FAST BLUETOOTH SET UP & IP65 WATERPROOF -Very easy to install, No need to disassemble walls or door panels,Works on any home, with or without existing doorbell wires. IP55 dustproof and waterproof rating; works between -13 F to 131 F; withstands various harsh weather conditions LONG BATTERY LIFE & ENERGY SAVING -The Rechargeable Battery (3000mA) last up to 6 months on Single Charge with USB Cable Included. The battery life can last up to 3 years. GROUP NOTIFICATIONS AND SHARING -The group function could notify all family members at the same time when someone presses the doorbell. Group can use Dophigo app to exchange messages.