WarBird Intrepid BT-Bluetooth Rechargeable 23dB Earmuffs with Gel Ear Seals Black. The Bluetooth capability is what sets these apart for those who need to remain connected while they work. You can leave your spare batteries at home the Intrepid BT recharges with a common Micro USB cable. Specifications for WarBird Intrepid BT-Bluetooth Rechargeable 23dB Earmuffs with Gel Ear Seals: Manufacturer: WarBird Color: Black NRR: 23 dB Quantity: 1 Battery Type: Lithium Ion Features of WarBird Intrepid BT-Bluetooth Rechargeable 23dB Earmuffs with Gel Ear Seals Bluetooth Enabled with Three Operation Modes Two Omnidirectional Microphones Full Dynamic Range HD Speakers for Clear Balanced Sound (40mm 20 ohm) High-Definition Sound Effects Low Frequency Tuned for Natural Sound Clarity Sound Dampening Composite Housing Sound Active Compression- 0.01 Second Reaction Time HiFi Audio Input Jack- 3.5mm Positive Response Power Volume and Select Buttons TPU Covered Gel Ear Pad Comfort Headband with Metal Frame USB Charging Port (Rechargeable) Up to 8-Hour Battery Life with Auto Shut Off High Definition Sound Effects Package Contents: WarBird Intrepid BT-Bluetooth Rechargeable 23dB Earmuffs with Gel Ear Seals Semi-Rigid Case Charging Cable WarBird EAINBT: Intrepid BT-Bluetooth Rechargeable 23dB Earmuffs with Gel Ear Seals Black