Bosch Battery System Controller. Reduced to the essentials the System Controller is the control unit for Ebikes with the smart system. The scope of functions and information is deliberately limited - so you have a quick overview that won't distract you when riding. The System Controller is seamlessly integrated into the top tube - this gives the already robust companion additional protection is hardly noticeable and is perfect for sporty tours and design-oriented eBike fans.LEDs use different colors to indicate the riding mode as well as the battery charge level in 10% incrementsThe System Controller makes your Ebike smart - and is the interface for software updatesThe System Controller is barely noticeable integrated into the top tube made of sturdy material and protected from knocks and scratches.With just two buttons you can control the most important functions of your eBike: Turn your eBike on or off and change the riding mode