Technical specifications * Sound scheme 2.0, stereo * Number of bands 1 * Type of earcups bass reflex type * Bass reflex port place back * Total output power (RMS) 20 W * Signal to noise ratio 85 dB * Frequency range 85?20000 Hz * Driver size 2 x 2.5 " * Driver unit impedance 4 Ohm * Wireless connection Bluetooth 5.1 * Operation range 10 m * Backlight LED * Lighting effects yes * Backlight off function yes * Power supply Li-Ion battery, via USB, 5V * Battery capacity 2400 mA·h * Battery type 18650 * Operation time on one battery charge 5 hrs * Battery charging time 6 hrs * Built-in FM-tuner yes * Tuner frequency range 87.5?108 MHz * MicroSD card support yes * USB flash drive support yes * Maximum supported capacity of memory card / USB flash drives 32 GB * Audio file formats MP3 * Microphone jack 6.3 mm jack * Microphone in ports One * Automatic shutdown time 10 min * Housing material plastic * Color black