Cateye rapid x3 rechargeable rear lightstay visible when cycling in the dark or in low light with this rechargeable rear light from cateye. Ideal for commuting or road cyclists this light features an illuminating 150 lumen output and up to 30 hours of battery life depending on the mode. It comes with its own mounting system so you can easily attach it to your seatpost and is rechargeable for your convenience. 6 different light modeshigh mode 150 lumens 1 hrlow mode 20 lumens 5 hrsflashing mode 30 lumens 30 hrsrapid mode 50 lumens 16 hrsgroup ride mode 20 lumens 16 hrsdaytime hyperflash mode 30 lumens 8 hrsfeaturesbattery indicatortwin cob led stripslumens 150 outputlight modes 6 different light modesruntime up to 30 hoursbattery li ion rc batteryrecharge time 3 hoursrechargeable usb rechargeableruntime 1 30 hours depending on the modecharger micro usb cable includedseatpost measurements rubber band mount fits 12.0 32.0mmdimensions 74.0 x 31.0 x 39.0 mmweight 46g with batteriesbuy cateye lights from chain reaction cycles, the world's largest online bike store.