Enjoy Watching TV at a Long Distance - No Technical Challenges, Never Worry about Running Out of Power BEWARE: No professional sound amplification built-in. For headsets with professional sound amplification, please go and have a look at SIMOLIO SM-905TV OR SIMOLIO wireless tv headphones and speakers series.TVs that only have optical and / or coaxial audio output will require a digital to analog converter (e.g. SIMOLIO SM-DAC01, not included, purchase separately) to work. When using DAC (DAC with volume control is advisable) for connection, TV's audio format must be set to "PCM"/"LPCM".Wired headphones ONLY. NO battery or NO power cable required. Cannot be used as wireless headphones for TV.For some TVs, if there is no sound after connecting headphones to the proper "AUDIO OUT" jack, please set your TV audio settings to "Headset" or "External Speakers". Please refer to the TV Setting menu for more information, as the settings vary by brand. Soft Memory Foam Earmuffts Ensure Lasting Comfort The super soft memory foam earmuffs provide comfort to the ears during continuous TV watching. The over-ear design plays the role of p a s s ive noise reduction, which blocks the outside noise and greatly improves the listening efficiency. Adjustable and Rotatable 5-level adjustable headband provides comfortable and customized wearing experience, headphone can be rotated 90 degrees. Extra Clip for Shirts or Collars Includes a chip for shirts or collars to avoid loose cable moving around. Long Cord + RCA Converter Cable + Extra Eartips Cable length (fully extended) : 4.6m coiled cable + 2m extended straight cable. RCA converter cable included. In-Line Audio Control and Microphone In-line audio control with mic allows you to handle hands-free calls and control music, ideal for video calls and video games on cell phones, tablets and laptops. Note: some in-line audio control functions are dependent on the make/model of your device. Using Microphone on Old PC/Laptop PCs/ Laptops with separate audio and microphone jacks will require an audio mic splitter to use the microphone. Work perfectly for Skype, MSN, Zoom etc. Bring convenience for meeting or online learning. 21.6 ft Cord Long Enough to Move Around Work Cubicle