Saicoss Card Lock Padlock + (Punched) Card Keys - ebay ad

[VancouverSpecial]

Saicoss Card Lock Padlock + 2 punched card keys

I saw this cool looking lock for sale on ebay the other day - anybody ever handle one? How does the lock work?

The card has the following instructions: "Insert card key and push left".
Both cards have the same pattern of holes but why are they two different sizes? Do they have different functions?
Not much info to be found via google - other than Saicoss manufactures other kinds of lock as well (e.g., u-locks)/

The key cards remind me of the old computer punch cards for data input in the 60's and 70's - both have manually punched out holes that encode the data and are fed into and read by a computer, or in this case lock.

padlock front view + 2 keys


padlock back view + 2 keys


Padlock front view - closer



Ebay link for those interested - I have no affiliation:
http://www.ebay.com/itm/221493267022?ss ... 1423.l2661

Note: photos are not mine but copied from the ad (user name: orlandostar)

Cheers fellow KP'ers,
Sean

edit - add search info result + photo credit