Based on the popular S-650, the S-680-02 Tinnitus Sound Therapy System is a great option for anyone who suffers from Tinnitus who would like to benefit from specially developed sounds for Tinnitus relief as well as the ability to customise the sound list to your own personal ...Based on the popular S-650, the S-680-02 Tinnitus Sound Therapy System is a great option for anyone who suffers from Tinnitus who would like to benefit from specially developed sounds for Tinnitus relief as well as the ability to customise the sound list to your own personal preference. With a modern, sleek design the S-680-02 offers a seamless and relaxing experience, with a Sleep Enhance mode that uses advanced sound processing to slowly and gradually fade out the sounds, allowing you to slip into a gentle and restful nights sleep without having to worry about turning the Therapy System off. Features: Will play a mix of up to 24 pre-loaded expertly crafted and relaxing Sound Oasis sounds Both sleep and nature sounds play at a higher quality than a CD, meaning you can fully immerse yourself in the relaxing audio 3.5mm headphone jack for use with own headphones/earphones or pillow speakers Improved clock and alarm setting features- backlit alarm clock, you can customise the alarm sound or chrime and brightness control Sleep timer with automatic shut off: continious play is available or auto shut off can turn off the machine in 30, 60 or 90 minutes Powered by 4 "AA" batteries (not included) for portability or AC adapter (included).