Sony WH-CH520 Wireless Headphones with Microphone, Black Energizer Duty cycle is defined as

Duty cycle is defined as the maximum number of pages per month of imaged output

15-Minute Delay Off Timer

Other features such as full 1080p HD resolution

Natural and exceptionally spatial sound is achieved thanks to the open-back circumaural design

Sony WH-CH520 Wireless Headphones with Microphone, Black Energizer Duty cycle is defined asStunning sound and longer battery life Enjoy high sound quality all day long. The WH CH520 headphones with up to 50 hours of battery life, stable connectivity, and enhanced call performance, meet the demands of your day. Product Highlights: With up to 50 hour battery life and quick charging, youll have enough power for multi day road trips and long festival weekends. Great sound quality customizable to your music preference with EQ Custom on the Sony