GS Extreme 2.0 delivers 3 products in 1; it’s like having Bluetooth ear buds noise isolation headphones and electronic earmuffs all in one product. Make these your new ‘Go to Ears’! – SportFit ear hooks to comfortably stay in your ear – Rechargeable lithium battery on lanyard – Up To 25 hours hearing enhancement & protection run time – Up To 120 hours standby time – Control sticks for Bluetooth and hearing & protection volume – Sound Enhancement & Hearing Protection – 5.0 Bluetooth Audio For Studio Quality Audio & Hands Free Communication – Compresses Loud Sounds At 85 dB or Louder – 6.5 Premium Dynamic Speaker – 0 HZ-40000 HZ Sound Spectrum – 19-29 dB SNR / 13-23 dB NRR (depending on the ear tip style; foam provides more)