The "+E-Tube port" variant is intended for e-bikes without a free E-Tube port - usually e-bikes with one of these components: Satellite System ON/ OFF Switch Di2 (electronic gear shifting system) PROPERTIES: Maximum speed: unlimited Speed limiter: deactivated Activation/deactivation: SpeedBox App/ LIGHTS Display shows: real values up to 23 km/ h then the actual values are only displayed in the SpeedBox App Compatible with: motors EP8 les moteurs EP8 RS Giant Revolt (up to 35 km/h) SpeedBox App Not compatible with: Shimano EP801 SpeedBox App for SpeedBox 1.3 B.Tuning SpeedBox App is an application specially designed for SpeedBox 1.3 B.Tuning, which uses Bluetooth technology to connect your e-bike to your mobile phone. After downloading the application and connecting your mobile phone to your e-bike, you will see current data and trip parameters displayed on your phone. You can store your trips, compare the results with friends and monitor your performance and progress. Thanks to that, you may fully enjoy the ride and leave the performance data analysis for later. SpeedBox App features: Tuning control: Activating the "double-click tuning control" function Speed limit setting Saving and viewing your trips We recommend downloading SpeedBox App to your phone before ordering the SpeedBox 1.3 B.Tuning chip. You can try out our demo version and get to know all the awesome features and, at the same time, make sure that the application is fully functional on your phone. To connect to the SpeedBox B.Tuning chip, your phone needs to be equipped with Bluetooth 4.0 or higher.