From their post:
These are acoustic mirrors, based on the WWI installations that can be found around the southern and eastern coasts of England (in this case, specifically the ones at Denge in Kent). They make ideal mission objectives for games of Land Ironclads or Aeronef.
VLI-8001 Acoustic Mirror – £1.50
VLI-8002 Listening ears (x2) – £1.00
Since we're releasing these during the Xmas sale, you can get them at 15% off until the end of December, along with the rest of the Land Ironclads and Aeronef ranges and pretty much everything else.