The Pentax ME is a classic late 1970's basic 35mm film SLR.
It has aperture-preferred automatic electronic exposure control. The only manual settings are 1/100 and Bulb. It runs on two common A76 cells. You focus and pick the aperture, and the Pentax ME picks the shutter speed automatically.
It works great. I shot a 36-exposure roll of Fuji Velvia in an hour and had a blast. I got back 39 perfectly exposed transparencies.
The finder has a line of LED dots that light next to the corresponding shutter speeds. They read OVER and UNDER, and 1/1,000 to 8 seconds. The ME is perfectly happy exposing for much longer than its rated 8 seconds if you're shooting at night.
The Pentax ME was a direct competitor to the Nikon EM. Even the model names are the same, spelled backward.
The Pentax ME is a very small SLR, smaller than even the eternal K1000, but it has a huge viewfinder. The finder of the Pentax ME is bigger than the finder of any Nikon SLR, ever.