Where can I find the batch number of the RockCoco?

The batch number of the RockCoco 10.0 (10 arms) can be found on a sticker on the transformer.

The batch number of the RockCoco 12.0 (12 arms) can be found on a sticker underneath the red "spider".

The batch number begins with 2011, 2013, 2014, 100 or 200.