Green Lion Echo Max Headphone

-Autonomy: 50 hours at 50% of the maximum volume in Bluetooth mode
-Charging Method: USB-C / USB-A cable included
-Integrated Battery: Lithium-ion polymer 3.7V 500 mAh
-Headset Sensitivity: 102 dB ± 3 dB
-Frequency Range: 20 Hz – 20 kHz
-Maximum Range: 10 meters
-Signal/Noise Ratio: 90 dB
-Bluetooth Version: 5.3
-Magnet Size: 40 mm
-Built-in Microphone
-Impedance: 32Ω
-Aux Cable