4k and a higher frame rate than cheaper models. You may even get a decent still face shot of an uninvited visitor. The sensor is not PIR but seems to work on a change in brightness. The sun coming out from behind a cloud, car headlights, sun and shadows. Don’t rely on the pushed alerts as it goes off all the time with light changes, even on the least sensitive setting. On the upside with a 64gig sd card it will record everything (and a lot of false alerts)