Moon nebula rear light rectangular ring super bright red led with a rechargeable lithium polymer batterywater resistant cnc machined aluminium casingtool free installationsize 93 x 22 x 17 mm8 modes approx run times over drive 1hr10mins high 2hr15mins standard 3hr30mins low 7hr30mins 10 flashing 20hr40mins 50 flashing 4hr30mins 100 flashing 2hrs10mins and strobe 10hr35mins