Product Description The BM-DN100 Di2 battery mount by Shimano enables wireless communication The is much more than just a mount - as a master unit it has Bluetooth and thus establishes a wireless connection between a separately available wireless unit (e.g. SC-MT800, EW-WU101) and a tablet or smartphone. This is perfect for quick adjustment on the road or for detailed analysis in the workshop. BM-DN100 was specially designed for the external battery SM-BTR1, which (unlike BT-DN110) is not Bluetooth-compatible itself. There are three different versions: a long mount for external cable routing, a long mount for internal cable routing and a short mount for external or internal cable routing. Mounting material is supplied. Information regarding the return of batteries and electrical equipment:Information on the return and disposal of batteries and electrical equipment can be found here. Technical Information:Number of E-Tube Ports:1Number of E-Tube Connections:0Models:long or shortMount:boltsCable Routing:external or internal (EW-SD50)Compatibility:Dura-Ace Di2 9070Dura-Ace Di2 R9150Ultegra Di2 6870Ultegra Di2 R8050GRX Di2 RX815Alfine/Nexus Di2*XTR Di2 M9050XT Di2 M8050 * only in conjunction with SC-MT800, not SC-S705 Features:mount for external battery SM-BTR1Bluetooth LE compatible (Master Unit)E-Tube project ensures firmware updatesModels:external/internal short: Battery Mount Type:shortCable Routing:external or internalManufacturer Number:I-BMDN100S1 external long: Battery Mount Type:longCable Routing:externalManufacturer Number:I-BMDN100LB internal long: Battery Mount Type:longCable Routing:internalManufacturer Number:I-BMDN100IBContents:1 x Shimano Di2 BM-DN100 battery mountexternal long version: 1 x bolt, 1 x cable tie, 3 x washersinternal long version: 1 x bolt, 1 x cable tie, 3 x spacers, 3 x washers, 2 x cable coversexternal / internal short version: 2 x bolts Manufacturer: Shimano Europe B.V. High Tech Campus 92 5656 AG Eindhoven Netherlands info@shimano-eu.com