DIY: Shutter Release Switch for Canon DSLRs

I bought Canon's remote switch (RS-60E3) last year, but it's lost. For shooting July 4th fireworks, I need a remote release switch. Instead of buying the same stuff again, I decided to build one by myself.

 

The design is simple for now. It has just 2 buttons, 1 toggle switch, and a 2.5mm jack.

 

I left some extra space in the case. This is for microcontrollers that I'm planning to install for time-lapse shooting. Right now, I just don't have enough time to do this :-(

Done