SureFire Universal Acoustic Coupler Assembly Black. The UAC is designed to be fitted to either left or right SureFire earpieces without compromising the direction of the filter or the radio acoustic tubing. Its two-position cap provides maximum hearing protection when closed and situational awareness when open.The sound tube connects to a wide variety of commercially available two-way radio headsets. Theres simply no better non-electronic filtration device available. Specifications for SureFire Universal Acoustic Coupler Assembly: Manufacturer: SureFire Size: One Size Color: Black Quantity: 1 Features of SureFire Universal Acoustic Coupler Assembly Made from high-strength polymer that is durable discreet and ultra-compact Two-position cap for maximum hearing protection or maximum situational awareness with SureFire earpieces 90-Degree ergonomic design to couple around-the-ear tubing and SureFire earpiece noise filters Quick disconnect adapter is included which connects the coiled sound tube to commercially available two-way radio headsets Package Contents: SureFire Universal Acoustic Coupler Assembly SureFire EA10-UAC-ST: Universal Acoustic Coupler Assembly Black