Lightweight, ergonomic battery pack specially developed for the Festool ETSC, DTSC and RTSC cordless sanders. Ensures complete mobility and maximum comfort when sanding. Equipped with Bluetooth, which enables Bluetooth-compatible mobile dust extractors such as the 'Cleantec' to start automatically when the cordless sander is switched on. LED display quickly shows the remaining battery capacity. Used in combination with the Bluetooth function of the battery pack, Festool WorkApp enables additional functions, including detailed display of charging status, operating data such as temperature or charging cycles, and also identification of the battery with the lowest charge status. Software can be updated to work with the latest tool functions. Works with - iOS App - Android App Bluetooth Equipped LED Display Hub Not Required Works with - iOS App - Android App Bluetooth Equipped LED Display Hub Not Required