Noise reduction rating: 25 decibels. Left and right ear buds. Sound activated compression to protect hearing. Digital sound processing. Independent volume control. On/off power switch. Integrated omni directional microphones. Full, dynamic range speakers. Includes: Foam ear buds (S,M,L), Sure-Lock sizing fins (S,M,L), Removable lanyard, four #10 batteries, and carry case. Matte black with carbon fiber accents. Boxed with hanging tab.