Power Muffs - Compact Series. Provides up to 5 times hearing enhancement. NRR (Noise Reduction Rating) of 24dB. 50dB of power. Helps protect hearing from sudden or sustained loud sounds. Electronic Sound Activated Compression circuitry provides another layer of protection. Features two microphones which improve sound directionality. Black finish. Batteries included. Compact size is ideal for smaller heads, women and youth. Hang packaged.