The Zielgerät 1229 also known in its code name Vampir, was an active infrared device developed for the Wehrmacht

Wehrmacht

The Wehrmacht – from , to defend and , the might/power) were the unified armed forces of Nazi Germany from 1935 to 1945. It consisted of the Heer , the Kriegsmarine and the Luftwaffe .-Origin and use of the term:...

 for the Sturmgewehr 44

Sturmgewehr 44

The StG 44 was an assault rifle developed in Nazi Germany during World War II and was the first of its kind to see major deployment, considered by many historians to be the first modern assault rifle...

 assault rifle, intended primarily for night use.
The ZG 1229 Vampir weighed in at 2.25 kilograms (about 5 lbs.) and was fitted with lugs on the StG 44 at C.G. Haenel at Suhl

Suhl

- Geography :Suhl sits on the south edge of the Suhler Scholle, an upthrust granite complex that is streaked by numerous dikes. This is part of the Ruhla-Schleusingen Horst that defines the southwest side of the Thuringian Forest...

, the weapons production facility. The grenadier carrying this was known as a Nachtjäger (night-hunter).