The Cosina C1s is a 35mm SLR made by COssian, whose products are more typically seen rebranded under other names.
While a manual-focus, manual-exposure camera may seem like a throwback in the 21st century, some users (and instructors of photography) still appreciate a camera that emphasizes the essentials, not unlike the venerable Pentax K1000. The C1s also uses the K Mount lens standard, and so can mount a wide variety of lenses dating back to 1975. On the more modern side, the vertically-traveling shutter reaches 1/2000 sec., and syncs with electronic flash at 1/125 sec. The shutter is mechanical and does not require batteries to operate; power is only required to illuminate the meter display LEDs in the viewfinder.