2K VIEW + 1:1 ASPECT RATIO + NIGHT VISION: With a combination of 4MP HD resolution and a 1:1 aspect ratio (150° ×150° x 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 ahead with Smart Detection, alerting you to people, vehicles, or packages. Unlock the FREE Rich Notification plan with your Reolink App account and receive up to 25 image alerts per day. Communicate in real time with visitors through video calls (only supported on iOS) and pre-recorded replies. LOCAL STORAGE: 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. WIRE FREE + FLEXIBLE POWER SOLUTION: Battery or wired installation supported. Regarding the wired mode, the doorbell is charged trickily thro