Innovative battery technology brings power and flexibility to your cordless tools with Festool's range of battery packs. Long lasting, and measurably superior to other cordless tools. Now you can achieve perfect results quickly and easily with the quality you expect, even when you’re not near an electrical outlet. Bluetooth® allows automatic starting of the CLEANTEC dust extractor when the cordless tool is switched on (requires use of a Bluetooth®-capable dust extractor); not compatible with all other Festool cordless tools. For use with ETSC 125, DTSC 400, RTSC 400 cordless sanders.