Code: Two omnidirectional MEMS microphones Sensitivity: 118,0 ±3 dB to 1 mW to 1 kHz Transducer size: 40 mm Battery, integrated (lithium) Battery duration (conversation time): Up to 18 hours Battery duration (hearing time): Up to 20 hours USB-C charging cable: 1,5 m Inalambrication technology: Bluetooth Version: 5.2 Inalambrico action radio: Up to 30 m