Crank-Powered Clipray Flashlight & Smartphone Charger, Hand Crank Emergency Power, Portable LED Light with Carabiner Clip, Cherry Red

I use this light all the time as my primary flashlight around the house and outside. I've had it for a year and a half now. I've gotten it wet (it stopped working until it dried out and then was normal again), dropped it and cranked it a lot over this time. I can say that the build quality is solid, with nice-feeling materials. It's great not to have to worry about batteries. I bought another as a gift for a travelling friend.The light output from the 3 LEDs is surprisingly good, with a wide spot. Pushing the button once keeps the light on, you don't need to continually press anything.The clip is a nice feature, I put it on my belt loop for illuminating the area when I need to use both hands.I can verify that the USB charger does work, but for modern cell phone batteries it really is a worst-case emergency backup. I tested it on my Samsung Galaxy SIII: You always get the best charging results when the phone is using the least battery, so turn on airplane mode and keep the screen off. The problem is that the charging only works while you are spinning the handle, and most phones will turn on the screen when you start charging. That means you can't turn off the screen while you're charging, and the output of the charger is so little that the drain from the screen almost negates the charge you're adding. In airplane mode with the screen on, it took about 9 minutes of quick spinning to go from 65% to 66%.As long as you keep in mind it's not going to work as a regular charger but would work in an emergency situation to get enough for a call, or to keep a call someone else is making going, then you won't be disappointed.

This product is very bright after just a little bit of cranking the handle, but it charges a phone battery slowly. Seems like the flashlight has some sort of battery, as it will store some energy for later. After 2 minutes of cranking, I used it for probably 15 minutes of light with no problems. Overall, very good for the price and what it’s intended for, I purchased 2 because it was very nice.

Flashlight.It's a good emergency flashlight. The beam is good for anything within a 30 foot range (and probably adequet for 40-50 feet as long as you don't need a spotlight). From my experience, the battery lasts up to 10 minutes after cranking for a few seconds, and up to 5 minutes in cold weather (~30-40 farenheit). It will still produce light after these limit, but will be significantly dimmer. The light fades as the battery gets weaker, so I typically recharge the device while I am using it to keep it bright. I've had this thing hold battery for several months (of nonuse) without being cranked. Overall I am very impressed with the flashlight portion of this product. 5 out of 5Clip.It is made of plastic and functional. I doubt it would hold much weight, but since it's only intended use is to hold the flashlight, that's okay.Phone Charging.It provides a charge. You need to crank to be able to charge anything, and it doesn't charge fast. Because of the size of the crank, it is a little difficult to charge without holing the flashlight with both hands. It doesn't come with a cable (I didn't expect it to). Overall, if you were in an emergency situation and had the time, this would be a good way to get your phone up by a few percent, but it isn't a way to seriously charge your device. I'm talking 5-10 minutes of work for 2-3% charge. Is it better than nothing? Yes. Can I see anyone taking 8 hours and 20 minutes to use this crank to charge their phone up to 100%? No. And, since it only charges while you are cranking, you can't store any energy for later (You can for the flashlight, but not for the phone charger. But, given how fast the flashlight charges and how long it lasts, it's not really worth doing it for the flashlight either.). It's enough to save your bacon, but you can't take it hiking and expect it to charge your devices.I am happy with my purchase, and have considered getting this as a gift for multiple family members.

I've had this device for about three months, and I can say that it's the ultimate flashlight. The three white LEDs are brighter than you'd expect, easily lighting up an entire room when reflecting off a white surface. That being said, here are some vital stats about it:Handcranking:60 seconds of cranking produces 60 minutes of light. (75 joules produced / 0.02 joule/sec use)USB Charging:The capacitors inside of the flashlight are not connected to the USB out.The flashlight will not charge your phone when you aren't cranking it.Measured in real-time via multimeter:Wall/Outlet Charger: 5V 650mA (Constant) = 3.25WFastest/Exhausting Cranking: 5V 500 mA (avg) = 2.5WNormal Cranking: 5V 250mA (avg) = 1.25WFor a standard Android phone with a 4.2V/1.8A/7.56Wh battery, you need to charge it from the wall for about 2 hours and 20 minutes.For a standard iPhone, a 4.2V/1.5A/6.3Wh battery, you would roughly two hours to reach full charge.To reach 0->100% on an iPhone while hand cranking at the normal speed you would need to crank non-stop for *five hours*. At the fastest cranking speed, this is reduced to 2.5 hours, but who is going do that?Once again, not as practical as you'd imagine for charging cell phones, but a lifesaver in emergency situations. Cranking for a few minutes *will* give you time to make emergency phone calls -- or have a friend generate power while you make the outgoing calls.For anything more serious/long-term than an emergency phone call, consider solar panels (20-100W) or a bicycle generator with a dynamo (100-400W).