The Ellipse Aura combines Fishman's most sophisticated onboard preamp design with the power of Aura Acoustic Imaging Technology for exceptional accuracy and true to life sound. Up to 4 Images can be downloaded from the Aura Image Gallery software (included) via an onboard mini-USB port to match the instrument's natural tonal characteristics. The Ellipse Aura features Pickup/Image Blend, Volume and switchable Natural I and Natural II low frequency tone shaping. A Phase Switch and automatic Anti-Feedback device control feedback. The pickup's ergonomic sound hole-mounted design puts slider controls at the player's fingertips to maintain a natural playing position. A patented neodymium magnetic mounting system enables easy, solder-free installation with a variety of size formats that accommodate most round sound holes from 3 7/8' (98mm) to 4 1/8' (105mm) in diameter. Equipped with a Low Battery indicator, the Ellipse Aura includes a no-hassle, solder-free Acoustic Matrix under saddle pickup in narrow, wide, or narrow/split formats. Features: State-of-the-art onboard preamp featuring Fishman's Aura Acoustic Imaging Technology Up to 4 Aura Images can be downloaded from Fishman's Aura Image Gallery software (included) Ergonomic sound hole-mounted design puts slider controls at your fingertips to maintain a natural playing position Unique patent-pending neodymium magnetic mounting system for easy, solder-free installation Accommodates most round sound holes from 3-7/8 " (98mm) to 4-1/8 " (105mm) in diameter Pickup/Image blend control Volume control Phase switch (feedback control) Automatic anti-feedback Low battery indicator Switchable Natural I and Natural II low frequency tone-shaping built into preamp