Walkers Single Mic Electronic Ear Muffs 22 dB NRR Black. 50dB Sound Activation Compression Volume Control Knob Power Source ? 1 ?AAA? battery included Specifications for Walkers Single Mic Electronic Ear Muffs: Manufacturer: Walkers Color: Black NRR: 22 dB Quantity: 1 Size: One Size Battery Type: AAA Alkaline Battery Quantity: 2 Additional Features: 4x Hearing Enhancement Included Accessories: Standard Age Group: Adults Features of Walkers Single Mic Electronic Ear Muffs: Single Wind Resistant High Frequency Mic; 4x Hearing Enhancement; Power - 50db; Volume Control; Sound Activated Compression (Sac) Package Contents: Walkers Single Mic Electronic Ear Muffs (x2) AAA Batteries Walkers GWP-WLK1MEM: Single Mic Electronic Ear Muffs 22 dB NRR Black