The Bosch GCA30-42K Bluetooth® Dust Control Auto-Start System eliminates the need to manually start and stop a paired 18V power tool and corded dust extractor, helping to increase worker productivity and reduce worker fatigue while on the job. The GCT30-42 Bluetooth® Auto-Start Remote Transmitter can be fastened with adjustable attachment bands (included) to both Bosch and competitor 18V concrete, drywall and woodworking power tools having the ability to be connected to a corded dust extractor. The transmitter detects when the power tool is switched on or off, prompting the GCA30-42 receiver on the dust extractor to start or stop automatically. While the auto-start functionality makes it intuitive and easy to use, the remote transmitter can also manually start or stop the dust extractor if needed. A bright, highly visible LED status indicator light displays the status of the connection between the receiver and remote transmitter (established, weak or disconnected), even in dimly lit work areas. The GCT30-42 Bluetooth® Auto-Start Remote Transmitter is water and dust resistant with IP54 protection to withstand tough jobsite conditions. The Bluetooth® Dust Control Auto-Start System includes the GCA30-42 receiver, GCT30-42 Bluetooth® Auto-Start Remote Transmitter, three attachment bands and one 3V coin cell battery.