ROPE HEARING ENHANCERSound Activated CompressionHigh / Low compression modePowered by Rechargeable Li-Ion batteryContinuous Working Hours: 15 hoursHigh Gain Omni directional microphones for clear sound enhancementHD speakers in the earbuds for wide range audio quality3 pairs of foam tips (S / M / L) includedRechargeable Lithium battery12 inch USB charging cable includedEVA Storage Case includedNRR (Noise Reduction Rating) 29dBWARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov