Update : I be too harsh when I write the original review . in fact , I buy two more to have handy in case of power failure . if you use a flashlight for work , say plumbing or cabling in darkish area , the lack of a single button be a pain ; for a reliable light that keep the battery fresh a long time , this be a good buy . + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + good , solid little flashlight , and very bright . just be aware that there be no button ; you must rotate the head to turn it on , mean you need two hand . this be not the flashlight to keep by you bed at night , because if you hear a sound and have to reach for protection and the light , you will be fumble to turn this on . yes , it be possible , with practice , to turn it on with one hand -- if you hand be large and strong enough -lrb- but not too large ! -rrb- . another situation : if you be out walk in the evening and a car start come towards you , a button to turn on the light quickly be much better than fumble around try to twist the head . of course if you hand be sweaty or you have put on some lotion and suddenly need a light , again , you need two hand , and even then , you be fumble . on a postive note : one way to measure a flashlight 's quality be by how well it preserve battery when not in use . this be almost as good as its d cell sibling , and much better than any other aa flashlight that I have use . battery stay fresh in this a long , long time .