The Gralab Model 451 is a dual memory switching timer/ intervalometer.
It has all of the features as the 450, plus two independent, separately programmable memories allowing for operation as a single cycle switching timer as well as a continuously recycling intervalometer.
It also has a third time option that is adjustable in increments from 1 to 99 minutes.
Note:
Requires plug adapter
Built-in metronome
Temperature range from 0-55C, Humidity range from 0-95% non-condensing
Backlit keys