Installing FlexPro’s N-Vison Bicycle Night Lights  Before installing your FlexPro N-Vison Night Lights for Bikes, slide back the cover. From the Battery compartment, and install a 9-volt alkaline battery.  With normal use the battery will last from several nights to weeks of use. /td>   STEP 1   You can install the bicycle safety lights directly to the spokes with the wheels [...]