Possibly exclusive to Taiwan, a store chain called "Family Mart" have released some oversized Transformers Kreons for mobile phones.

There are five - Megatron, Optimus, Starscream, Bumblebee, Sideswipe.

Three have LED lights in the chest - Megatron, Bumblebee, Sideswipe.
Two have a stylus (pointer) attached to the head - Optimus, Starscream.

No size comparisons have been shown, but there is a photo of one attached to a phone, so look like they could be about twice the size of a regular Kreon.