Festool pioneered automated dust collection with power tools. Hook your tracksaw up to the vac, pull the trigger on the saw and the vacuum automatically kicks on.
The gap in this system has always been with cordless tools. When drilling a series of holes into powdery sheetrock or creating chips with a Forstner bit, it would be handy to have the vacuum kick on when the drill does, without you having to walk back to the vac and turn it on manually each time.
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So now Festool has figured out how to do that via a retrofittable Bluetooth module. Users can choose to either switch the vac on using a button mounted on the business end of the hose, or they can spring for a Bluetooth-equipped battery that will trigger the vac automatically:
The Bluetooth Module with the hose-mounted on/off button runs $80, while the Bluetooth-equipped 18-volt batteries run $125, which is $15 more than their standard battery.
Source: core77