BOSCH Display Purion 400 BHU3500The Bosch Purion 400 Display BHU3500 is the minimalist display for Smart System e bikes compact, rugged, and perfectly positioned for eMTB use where a larger display would be vulnerable to impacts. At 1. 6" it shows exactly what you need and nothing you don't, tucked safely into the handlebar triangle. Key Features 1. 6" compact colour display clean, distraction free readout Splash and dust protected to IP rating Impact secured in the handlebar