Austrian Audio Hi-X25BT; closed-back, wireless Bluetooth headphones; All metal hinges and bow for maximum durability; foldable construction for easy transport; memory foam ear cushions for maximum comfort; Bluetooth version: 5.0; Operation: touch control; Various connection options: analog via jack, digital via USB-C and wireless via Bluetooth; Battery type: built-in lithium polymer battery; Runtime: max. 30 hours; Frequency range: 12 Hz - 24 kHz; Sensitivity: 113 dB SPL/V; Impedance: 25 Ohms; Input power: 150 mW; Scope of delivery: 1.2 m USB-C cable incl. USB-C-USB-A adapter and 1.4 m USB-C to 3.5mm jack cable incl. adapter to 6.3 mm jack; Dimensions: 205 x 170 x 80 mm; Weight (without cable): 270 g