ACTIV 400S – PROFESSIONAL STEREO BLUETOOTH HEADSET WIRELESS BLUETOOTH 5.2 CONNEXION – FOAM EARPADS WITH SYNTHETIC LEATHER – UNIDIRECTIONAL FLEXIBLE AND ADJUSTABLE MICROPHONE – LIGHT ALUMINIUM HOOP – LITHIUM BATTERY 180 MAH – AUTONOMY : 20 HOURS – STAND BY : 220 HOURS – CHARGING TIME : 3 HOURS – IMPEDANCE : 32 OHM – COL. BLACK.