Is my Bento box microwavable?

I recently bought a new bento box and I have no idea whether or no it is microwave safe. It's a two tier box, with a lime green lid. It's an oval and says color combination original collection on the lid. It has chopsticks that are in to pieces and can be put together inside. It came with one divider in the top level. The box came with a cloth rubber band around it.

There was a sticker on the bottom but it was all in japanese. How do I know if my box is microwave safe?Is my Bento box microwavable?
Bento food is eaten at room temperature, so the bento box was probably not designed to be microwavable.