Bought half a dozen last year, one on helmet one on road bike,rest to mates, one on the helmet with tie wraps(semi permo winter helmet) is excellent,mates dont thank me for it if i try and talk to them!!! lasted about 2 hour full plus 1.5 on flash on saturday before cutting out no warning, but it was daylight then( early start)!! no reported faults with these 6 ,but mate bought one last week and the battery case strap snapped on ride 2 leaving him in darkness and the battery back down the road,worked fine after mounting in top pocket,cant be bit at under £30.