This is a must have when out camping or walking, even used around the house when the street had a power cut. The lumens is very bright/bright enough for our use. You can see a good distance ahead clearly. A friend had a more expensive head torch than mine, mine out performed theirs!
The strap is extendable, so good for all head sizes. I like the different settings on this model: distance lighting, proximity lighting, Red night vision/softer but still somewhat bright light. This Red light has come in very handy at times too. The ability to dim the strength of the light. Not used the strobe yet, but can imagine the impact at night in the open country side.
If I remember It take x2 or 3, AAA batteries.Take out the batteries when not in use. This helps to prolong the product life and reduce risk of batteries leaking.
This is a great buy for a small price! The fella has since bought one of his own, as was impressed with this.