For a backup flashlight, it is very good. It also has a battery life of 10 years in standby mode. The only drawback is that it has low brightness, but of course, I knew that beforehand. The lightweight and compact size are exactly what I wanted for the job

After 6 years of use of this tiny lens, I feel completely satisfied and happy that after so much time and many hours of use, the lens works perfectly and has not suffered the slightest damage. It comes in a package with a waterproof plastic case for transportation. Also, the lens is waterproof and has many settings such as low and high intensity, red perimeter light, red SOS light, and an extra whistle on the securing strap. The CR2032 lithium batteries provide satisfactory hours of use, approximately 80-100

Well, with this lens I was amazed! Very lightweight, 29 grams, dimensions 4x3 cm, durable, mini headlamp, waterproof (IP67), the batteries last for 10 years. When I was in the mountains, it illuminated the path well for at least 10 meters on the descent when night fell. The whistle is not very loud. In its case, you can also have spare batteries. The price is a bit high, but the build quality is very good. You can wear it upside down during night hiking, and cars can see the light (red or white), especially the red light from 300 meters away (as the manufacturer claims).