The Miracle TimeCube Timer, 1, 3, 5 and 7 Minutes, for Time Management, Kitchen Timer, Kids Timer, Workout Timer, Blue

I need to set it to 3 min 30 sec, can it do this? I am confused, are all the times preset or something?

Can the sound be turned off yet still work as a timer? Thinking, classroom use, therefore do not want a loud alarm going off...

When counting down 3 minutes, I want to be able to reset the timer to 3 minutes easily (for use in a game such as Scrabble) without hassle. Possible?

Can this be made to run on "solar," like calculators do? I love the design but hate to buy another thing that is going to need batteries.