Providing Situational Awareness Hearing Protection and Communication Solutions. Racal Acoustics solutions include headsets for Land, Sea and Air environments; for use in military, paramilitary, first responder, aviation and industrial markets. The acquisition of Racal Acoustics by INVISIO, which was announced on 22 December 2020, means that INVISIO and Racal Acoustics together, are broadening the offer with a complementary product category consisting of advanced and robust hearing protection and communications headsets for environments with constant high noise.