The Canon Digital IXUS 400 is a compact digital camera from 2003, sold in North America as the PowerShot S400 Digital ELPH. It belongs to the metal-bodied IXUS family that established Canon as a leader in pocketable early-2000s digital compacts.
It uses a 1/1.8-inch CCD sensor delivering 4 megapixels at up to 2272x1704 resolution, a fixed lens zooming from 36-108mm equivalent with an f/2.8-4.9 maximum aperture, a rear LCD for review, and stores images on CompactFlash cards with a proprietary lithium battery.
For its era the sharp metal shell, fast startup and responsive shutter made it stand out from slower budget rivals, though its resolution and low-light ability are modest by any later digital camera standard, typical of CCD sensors from the early 2000s.
These are now mainly bought as retro digital cameras or collector pieces rather than primary shooters. Buyers should check the CompactFlash slot reads cards reliably, test the battery still holds charge, and confirm the zoom lens is free of dust or grinding.