SightSensor NSxxx-320 and TCxxx-322 lines have been upgraded to NS4 and TC4, offering the same great detection, more pixels and superior value. If you have an existing design with NSxxx-320 or TCxxx-322 they can be updated to a similar 4-series device by following the brief steps here. Or contact us - sales@sightlogix.com - and we'll make the changes for you!