Koss HB79 Stereophone System Wireless Recommended use: home Audio. Connectivity Technology: Wireless Headphones form factor: on-ear Provides 250sqft of convenient cordless coverage. Connects to most audio and video systems. Dynamic element stereophone for extended frequency response. Adjustable headband for best fit. Folds flat for convenient storage and portability. Ideal for home theater. Requires 2 AAA batteries. Includes IR transmitter and AC adapter