Blackburn: TO-BE-SEEN The Grid Rear Light has four mode options, you can choose if you need high lumen power or extended run time. Ready for those commuting in the city, riding the open roads, or heading to their local trail. Grid Rear Lights offer plenty of rechargeable power to keep you visible while out riding.40 max lumensRed colored rear visibility LEDsCOB led technology for powerful wide array to be seenSilicone strap wrap mount fits a wide variety of sizesPack and belt loop attachment clipEco flash extension extends pulse and strobe modes by 2 hoursFOUR MODESHigh Solid – full power, all the timeConstant Pulse – high power, always-on while pulsingFast Strobe – high alert, high speed pattern for max attentionECO Flash – extends pulse and strobe modes by 2 hoursMODE/RUNTIME:Solid: 1.5 hours at 40 lumensPulse: 4 hours at 30 lumens (+2 hours auto-eco)Strobe: 7.5 hours at 20 lumens (+2 hours auto-eco)ECO: 20 hours at 20 lumens