First, the Revain part number is wrong. Genuine part number: TL-LD560-R, this is the Cateye part number. To check this, go to cateye.com and click on "Safety Lights". I bought this taillight for two reasons: 1) it has a built in (very good) reflector. 2) Cateye quality and customer service. If you use the "Long Life" mode, you get up to 120 hours. use. If you use "Flash" mode, you get about 100 hours. use. If you use the "permanent" mode, you get about 30 hours. use. It has two other modes which I think can be used for 60 hours. It doesn't "eat" batteries like some 1/2W and 1W flashlights (like Planet Bike and Portland Design). Of course it's not as bright as these, but for God's sake, do you really want to "blind" cyclists approaching from behind and cars approaching from behind? This cateye rear light is economical (batteries) and gives more than enough light to be seen. I recommend this flashlight to everyone else (I'm 63 and have been cycling all my life). This is the winner! You can go to cateye.com and click on "Safety Lightsโ and then download the manual for this and other cateye products.
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