49750 sounds like a Woods timer number, but I can't identify for sure
Woods makes timers for many other brands that are sold under different numbers
Amazon shows First Alert tm261 random vacation timer
If this is not your timer, then add a comment.
First Alert tm261 random vacation timer is similar to GE 15151 shown on following page.
GE 15151 has a manual
First Alert appears just below GE 15151
A vacation timer cannot be programmed.
Look closely at outer edge of dial and see that dial has small plastic protrusions that stick out.
These protrusions are trippers that cause timer to turn lights on-off at random times so home looks occupied when on vacation.