Remote (Intervallometer) for OM-D E-M5

Hello,

I would like to find good remote control with intervallometer easy to program and not too big and bulky. It will be used as a simple remote and occasionnally as an intervallometer.

Would like to have the shutter control in two separate steps: One for focusing the second for shutter.

Please advise which model is suitable and were to find it on internet.

Thank you.

Bernard