Sennheiser announces Momentum 4 headphones with new design and 60-hour battery life - The Verge
Sennheiser Momentum 4 Wireless Headphones - Bluetooth Headset for Crystal-Clear Calls with Adaptive Noise Cancellation, 60h Battery Life and Customizable Sound, Black - Walmart.com
Sennheiser's Momentum Wireless 4 Noise-Canceling Headphones Have Killer Battery Life