Bosch Kiox BUI330 Original Operating Instructions page 25

English – 25
USB connections are not waterproof. When cycling in the rain, do not
connect any external devices and make sure that the USB port is fully
sealed by the protective cover (17).
Important: If electrical loads are connected, this can affect the range of the
eBike.
Bosch eBike Systems 1 270 020 Ken | (25.08.2020)