Shake Shack is adding more tech to its stores — and it could mean a big boost to its bottom line

• Shake Shack says it expects to have self-service ordering kiosks in all of its restaurants by the end of Q3.
• The chain said the kiosks, currently in nearly 250 restaurants, are the chain's most profitable ordering channel.
• Consumers tend to order more from the self-ordering machines.  Kiosks also save on labor costs. 

As Shake Shack looks to control labor and improve profitability, the burger chain is turning to restaurant tech that's been around for years – self-serve ordering kiosks.