The Keystone Everflash 20 is an instant loading 126 camera. It has a built in electronic flash that is powered by two AA batteries. The battery compartment is inside the camera near the film loading area. the batteries also power the :electronic eye" which meters the light and helps get the correct exposure. It was manaufcatured around 1978 by Keystone a Division of Berkley Photo, Inc. Keystone was located in Paramus, NJ on Keystone Place.
It has a 40mm KEYTAR lens with an f stop of 5.6. It was made in the USA. The features were listed in the intruction manual as:
Optical Color Corrected Lens
Flash Ready Indicator
Low LIght Warning Signal