What kind of cable must be use?

[zafyraminx]

What kind of structure do you use so the stackmat can read by the android phone? i use 2 kinds of setup but still both of them are fail. I hope you can help me about this.

[MeigenChou]

You need a 3.5mm 1 male to 2 female audio mic spliter adapter to plug into the mobilephone.
But not all devices can connect the stackmat timer successfully, see http://www.jflei.com/stackmat-phones/ for more information.