quality bluetooth halter headset waterproof movement

headphones with bt sports metal shell hanging neck sound quality headphones bluetooth halter headphones waterproof sports features this is a very elegant bluetooth headset this is a water-resistant and sweat-resistant sports headset, high elastic silica gel material, any form of curve can be used arbitrarily, and the latter design avoids this. pf-be789.bluetoth: jl 5, 0.5 working distance: 10 meters; frequency: 20hz-20 khz; sensitivity: 110db (+5db). speaker: 10m. impdancia: 16. battery charging