Warranties and return policies for crowdfunded items & pre-orders?

We’ve crowdfunded and we are pre-selling but we haven’t started shipping yet. We’ve been getting questions about warranty and return policy.

What have people generally done/seen for crowdfunded/startup hardware? I haven’t really seen other campaigns discuss this up front, usually it seems to be something that people post only after they’ve been shipping for a while.

We want to give these people a reasonable answer, but also don’t want to lock ourselves into anything unreasonable.

Crowdfunding changes things, but there are all kinds of consumer production laws that require ODMs handle warranties and returns in a certain way unless the sale is described as “final”. Also, the state of CA is particularly strict on this stuff. Although, technically, none of this applies because crowdfunding is not a “sale” it’s a “donation”.

That being said: a 30 day return policy and 90 day warranty support against defects seems like the minimally right thing to do.