$18.20 with code AC18. Lowest shipping $1.30. Total $19.50 or about €18
Hot-rod quad-emitter flashlight with ramping interface and onboard charging via micro-USB. RRP at launch was $40. It was sometimes available for around $30 with a coupon. I think $18 is a price error or clearout.
Ramping interface means the brightness goes up and down smoothly when you hold the button. It has a very advanced UI and you can configure a bunch of stuff, thermal limit, change to a stepped mode, check the battery level etc. See link in the product page.
The body is too small to sustain 2000+ lumens continuously - it will get very hot and then the output will lower quickly to avoid overheating. So 2000+ is more of a party trick. If you start at a more reasonable level (500-800 lumen) it should not do much thermal throttling.
This is the deluxe S version which has a copper head. (The regular version is aluminium). The copper makes it heavier but looks cool and potentially pulls heat away from the emitters quicker.
The button lights up green when the flashlight is off so you can find it in the dark (uses a tiny bit of power, can be disabled).
Choice of Cree XP-G3 or Nichia 219C LEDs. The Crees are slightly more efficient (brighter and less heat) and throwy but most prefer the tint and better colour rendition of the Nichia's.
Requires an 18350 cell (not included), ideally high-drain. An 18650 tube is available for about €2 or €3, personally I would go with that because high-drain 18650s are more readily available. Note that li-ion cells are potentially dangerous and should be used with care/knowledge.