2K VIEW + 1:1 ASPECT RATIO + NIGHT VISION: With a combination of 4MP HD resolution and a 1:1 aspect ratio (150°×150°×180°), the Reolink Doorbell Battery camera provides an expansive head-to-toe view, offering excellent visibility of your front door and its surroundings. Day or night, it captures clear images without blurriness. SMART DETECTION + VIDEO CALL + QUICK REPLIES: Stay one step ahead with our smart detection feature, alerting you to any presence of people, vehicles, or packages. Engage in real-time communication with visitors through video calls and pre-recorded quick replies, all without monthly fees! LOCAL STORAGE + TWO CHARGING METHODS: With support for up to a 256GB microSD card, store ample recordings locally. Additionally, connect to Reolink Home Hub(not included) for expanded storage capacity. Enjoy the convenience of choosing between a rechargeable battery or hardwiring for continuous power. WIRE FREE + FLEXIBLE POWER SOLUTION: Battery or wired installation supported. Works with existing mechanical chimes for power and ringing when connected via wiring; supports DC 24V, AC 8-24V, and 5VA-40VA transformers. Note: 24/7 continuous recording is not supported. EASY INSTALLATION + MULTIPLE CHIME OPTIONS + SMART HOME: Even a beginner can get the doorbell up and running in minutes. Choose from multiple chime options to suit your preferences. Plus, seamlessly integrate the doorbell with Alexa or other smart home devices for enhanced functionality. Reolink Video Doorbell without Chime