I use IK Multimedia's iReg Blueturn wireless switch. It sends a Blue Tooth message to my score reader. It is powered by two AAA batteries.
Many switches are quite large and I wanted something that would rest on the ledge of my pedal board. The iReg BlueTurn is 4.75" wide by 3.5" high. The switches are far enough apart so you do not accidentally hit the wrong one.
Here is a link to a review:
https://www.youtube.com/watch?v=h9b-b9SwowoI also took a picture of the unit as I use it. I was not able to include that pic here, but I will send it to you if you PM me your email address.
On another note, I would like to add toe studs to my console, since it only has manual pistons. I believe someone could do nicely with members of this forum if they came up with an elegant solution for this.