NRR (ANSI): 22 db. Power supply: 2 x AAA(battery not included) Estimated battery life: 350 h Compliant with CE / RoSH / ANSI S3.19-1974 Waterproof: IPX-5 Color. 1 x 1pcs Tactical Headphones (No included other products). The package may be crumped, is normal and inevitable. We dont accept any dispute due to the package problem. If can’t accept this, kindly dont order from us. Tks so much for your attention! Below is picture for M31.