They turn on and they're bright enough. I got a pack of six and immediately stripped three of the cheap screwdrivers getting the first two screws out of one to look at the battery, and I somehow managed to lose one of those screws. I gave up after the first two screws and am waiting until a battery dies to open one because of the headache involved. These will be an absolute nightmare to change batteries in - should have paid more for the rechargeable ones.

These lights are very bright and have multiple flash patterns. The small size is great and compact for packing light (no pun intended).

Great bright lights, good to have as extra lighting on boats

I know these are for bikes or kayaks; however, our 5 year old son loves using these throughout the house and especially in his fort. The lights are bright with three different modes. The set came with 6 lights, 2x green, 2x white, a red, and a blue and EACH came in their own box and with a mini screwdriver which is super convenient! My brother also uses a red one on his backpack because he rides an electric scooter to/from work but leaves in the pitch black of the morning. Great for safety and fun! We can't wait to use them on our kayak for a night dive.

These LED lights are perfect for kayaking at night. They have 3 light modes, steady on, flashing and strobing. Which is great for visibility at night. I use these for early morning / night kayak fishing to be visible at night. I do inshore fishing where there can be boat and large tugboat and barge traffic. These lights could also be used for biking or jogging at night.They are small and easily attach to my kayak seat, rails or even a life jacket. These are surprisingly bright as well. The batteries last a long time as well. Overall, I am very happy with these and they illuminate my kayak really well at night.

These are very nice little lights. I'm sure you can read the description yourself, but they all have multiple modes, all of which work well. The lights aren't super large, but they are extremely bright. I can see them coming in handy for multiple situations. I'll clip a couple onto my dogs' leashes for walking them at night, also will work well to throw one onto my kayak for extra safety when it begins to get dark. For runners these would be easy to clip onto clothing for an evening run as well. For six lights to an order, they are very reasonably priced.

Just as pictured in the product image, I received 2 white lights, 2 green lights, 1 red light, and 1 blue light. These are very bright and honestly hurt a bit to look directly at while lit. Each light came packaged with a velcro strap and a tiny screwdriver for changing the battery.One button press turns it on to a steady light. A second button press turns it to a flashing strobe light. A third one brings it to a slower flashing light, more like what you'd use at night while riding a bicycle. And a fourth and final button press turns the light off.These are great for visibility at night when running or walking in the dark.

Great for my kayak at night!

These little lights are bright and have 3 settings for solid, slow flash, and fast flash. The on/off button is easy to find and adjust without stopping to look for it. They clip fairly easily to clothing, backpack, etc. Each light also comes with an elastic hook and loop strip so you can wrap it around a leash, strap, or walking stick. (The elastic is clearly latex, so be aware if you are allergic. It's pretty strong. I had to discard them.) Also included are tiny screwdrivers for replacing the batteries. That's a nice touch. I use these lights when walking the dogs and clip a couple of lights on my cargo pockets and one to the back of each dog's coat. I like the added visibility in the dark, and it seems that cars are swerving around me a little sooner than with my old, dimmer light. Overall, these are bright, lightweight, and convenient solutions to better night visibility.

These little lightweight lights are very bright. The first light function is solid, the second blinking fast and the third a slower blink. Each of the six lights (2 red, 2 blue, 2 white)) are boxed separately with a Velcro ring for attaching to your bike, purse, backpack, kayak, etc. and a small Phillips screwdriver. I immediately used the white light and clipped it to my shirt to see in the dark backyard. These are a good price and would also be a good emergency light to carry in your purse since they are so small and lightweight. Highly recommend.