Wireless headphones WACKEN: with foldable overhead headband, padded ear cups and headband, adjustable headband, compatible with Bluetooth®, hands-free function, with slot for microSD card, with integrated rechargeable lithium battery, capacity: 200 mAh, standby mode approx. 100 hours, charging time: approx. 1 hour, incl. USB charging cable with USB Type-C plug (length approx. 31 cm) and audio cable (length approx. 100 cm), can be used with audio cable when battery is empty or switched off