The HBB-EM-HM is a professional grade dual-muff headset that clips onto most safety helmets for construction and industrial use. NRR24 rating provides 24dB of hearing protection. Receive audio is heard over loud dual-muff earphones and the flexible boom microphone ensures clear audio on transmit. The HBB-EM-HM is lightweight, adjustable, and very comfortable. Available in Safety Yellow and Flat Black.