I occasionally wore these when going out. I purchased them on Amazon. I'm selling them now because I've been using earphones recently. Product Description Marshall Major V, black headphones with 40mm dynamic drivers, capable of over 100 hours of wireless playback. - Brand: Marshall - Model Name: Major V - Color: Black - Battery Life: 100+ hours - Driver Size: 40mm - Sensitivity: 100 mV: 98 dB ± 3 dB - Impedance: 32Ω - Included: USB charging cable - Bluetooth: Compatible Thank you for looking.