Online wholesale shop glow in dark colorful led wine bottle cork USB string light

What kind of files do you accept for printing?
------PDF, Core Draw, High resolution JPG.

Is the sample fee refoundable when I place order?
------Yes, sample fee will return when placing order, free samples is available if you pay for the freight cost.

What the lifetime of our battery?
------About 70 hours, we can supply spare battery if needed.

Can we mix color and size?
------No problem, but the lead time will be a little longer than sigle color& size.

Can we print or cusomize package if less than 2000 pieces?
------We can accept it if you can pay for the extra print fee & package fee.