The Musen LK-MAX wireless on-ear headphones in black provide a versatile audio experience powered by Bluetooth 5.4+EDR for a stable connection within a 10-meter range. These headphones feature 40mm speakers with a frequency response of 20Hz-20kHz and a sensitivity of 100dB±3DB, ensuring a balanced sound profile across various genres. Designed for mobility, the black frame is both foldable and retractable, featuring rotating ear cups that make them easy to pack in a bag. The internal 400mAh battery supports up to 20 hours of active listening on a single charge, which can be replenished in under 2 hours, while the device remains ready for use for up to 120 hours on standby. These headphones suit anyone looking for a practical, portable audio solution for daily commutes or home use.