Bluetooth wireless electronic earbuds with a free control app that allows for complete control of your Silencer BT Models from your SmartPhone. Features: Bluetooth 5.0: improved battery life and wide connection range Much more stable left/right earbud connection Touch button controls SAC (sound activated compression) Dynamic wind noise reduction Variable gunshot suppression Voice prompts Auto shut off NRR - 24db Battery - rechargeable lithium battery + rechargeable lithium battery in dock App supported - yes