Check the listing for details. Apogee Element 24 Thunderbolt - Audio I/O box for Mac. Condition: Open box, Made in United States. Listed at 209.99 USD. The Apogee Element 24 Thunderbolt is an audio I/O box specifically designed for Mac users in the music industry. This high-quality device allows for seamless connectivity and conversion of audio signals, making it an essential tool for musicians and producers looking to connect various audio sources and equipment to their Mac systems. With its Thunderbolt technology, the Element 24 offers fast and efficient processing, ensuring top-notch sound quality and performance for all your audio recording and playback needs. Item is in excellent condition. Open-box, never used except to test functionality. Confirmed connection to MacBook Air. Includes unit and power supply, no other cables or accessories are included.