HD·15 High-Definition Electronic Earplugs help you hear clearly at work or play – providing on-demand hearing protection and improved awareness of your surroundings. HD·15 High-Definition Electronic Earplugs use Etymotic Research’s ACCU-Technology with high-definition balanced armature drivers, high sensitivity microphones and wide dynamic range compression K·AMP signal processing. HD·15 High-Definition Electronic Earplugs were engineered for persons who operate around continuous loud noise such as power tools, machinery, loud vehicles, and construction equipment. Clear, High-Definition sound quality 2 Modes of blast protection: On-Demand Ear Protection Mode – Provides automatic 15 dB protection when steady-state noise exceeds safe levels and natural hearing when no background noise is present Hearing Enhancement Mode – Amplifies soft sounds and conversational speech but protects against loud impact noise Blast protection is active in both modes – LO (on-demand) & HI (enhancement) Ideal for: Contractors Safety inspectors Machinery operators Construction crews Warehouse personnel Woodworkers Mechanics Carpenters Package includes: 1 pair of HD15 earplugs Assortment of ACCU-Fit eartips Neck cord Filter tool ACCU-Filters Cleaning tool Size 312 batteries Zipper pouch User manual