To put it briefly:
The lamp is great!

I have had many headlamps. In different sizes and price ranges. Except for one large one, they were all rubbish. I have a good impression of this one.
The metal housing seems high-quality and robust, but not heavy.
The headband fits well and doesn't slip. Even after wearing it for a long time, you don't sweat under it. In fact, I recently forgot to take it off.
It's easy to use. Hold down and the brightest light comes on. It drains the battery quite a bit, though. But it's enough to light up the surroundings.
By simply tapping, you get to the normal levels.
Double-click for the red flashing light. OK, I admit, that doesn't really blow me away.

The strap can be removed and replaced with a normal clip, so the lamp can be clipped to a bag, jacket or something else.

I use the lamp in my toolbox. The low weight, small dimensions and super brightness make it an ideal companion for repairs around the house and car.

For around $15 you can get a good lamp that can keep up with well-known competitor brands.

This is a lovely bright head torch. The straps are adjustable and is a comfortable it. IT worked perfectly when going out to feed the birds late in the evening when it got dark. Happy with this product.

No matter what this manufacturer releases, you can always expect great quality. I am surprised by the price. I can't remember ever having seen a full-fledged Klarus product, not even a keychain flashlight, at this low price level. If the price is so low, what could the surprised me expect? In the end, I was pleasantly surprised because the product and its quality exceeded my expectations. The materials used are robust aluminum for the front cover plate. This is screwed into an ABS hard plastic housing. I cannot say for sure whether the lens is real glass or plastic glass. The pocket clip is of course made of stainless steel. I particularly like the versatile design, as this head lamp has over four light brightness levels. According to the advertising, the maximum brightness is 670 Klarus lumens and at the lowest brightness, namely 40 Klarus lumens, it can be used for five hours. That is longer than I have patience for! The light also has two flashing red lights as warning lights, which is awesome. But I don't think that's a problem, as it comes with a matching charging cable.
In any case, it has allowed me to say goodbye to the annoying constant battery changes. The Klarus headlamp offers the convenience of free recharging and offers me a sustainable and cost-effective lighting solution. The best or special thing about the product is that I can transform my light. The headlight is adjustable by 180 degrees, I just choose the desired lighting angle, quite intuitively. The light also has a removable clip. If I remove the clip, I can use the Klarus with a headband as a headlamp and go jogging with it. It all works wonderfully. With the clip installed, the lamp can be attached anywhere, including vests, collars, backpacks, belts, etc.

Great little headlamp that you can remove from the headband and clip it onto a bike helmet for me, the headband is great, holds very well, the power of the light is very good! Several levels of intensity

This is a must-have for anyone who needs a headlamp. It is very powerful and can illuminate a large area in case of an emergency when working or just walking in the dark. I was impressed by how long it lasted on a single charge. I verified that it could run for more than the advertised time, which is amazing for such a small device. The quality of the materials used is also very good. It feels sturdy and durable, not like some of the cheap ones I have used before. The strap is comfortable and adjustable, and it comes with a clip that can attach to a hat. It has four different levels of brightness, including a torch mode that is extremely bright. It also has a red-light mode that can be used to signal others of your presence. The charging port is protected by a rubber cover that prevents water from getting in. It comes with a USB cable that can be plugged into any standard USB-A charger. The only thing missing is a case, but that's not a big deal considering the low price. This is a great headlamp that is small, light, bright and long-lasting. I highly recommend it!