Full freedom, full performance with the new BT-DN320 battery. The completely wireless technology elevates your shifting system to a new level, providing an unparalleled clean and reliable riding experience. The BT-DN320 battery is perfectly integrated into the new wireless derailleur, securely protected and optimally positioned. Its precise energy management ensures lightning-fast and simultaneously buttery-smooth shifting, whether you're racing over tough trails or riding at race pace. Thanks to its closed, vibration-resistant design, it remains stable and reliable even under extreme conditions.