'Two contracts awarded to Cohort (LON:CHRT) by the MOD to supply and support hearing protection systems and communication ancillaries for land, maritime and air applications, worth a combined GBP5.5 million.'
Here, Cohort plc FD Simon R Walther explains the technical hearing protection system.
http://www.piworld.co.uk/2017/06/02/cohort-plc-chrt-tactical-hearing-protection/