The Ellipse Aura combines Fishman"s most sophisticated soundhole-mounted preamp design with the power of Aura Acoustic Imaging Technology for exceptional accuracy and true to life sound. Up to four images can be downloaded from the Aura Image Gallery software (included) through an onboard mini-USB port to match the instrument"s natural tonal characteristics. The Fishman 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 guitar pickup"s ergonomic soundhole-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 on your acoustic guitar with a variety of size formats that accommodate most round soundholes from 3-7/8" to 4-1/8" in diameter. Equipped with a low battery indicator, the Ellipse Aura pickup includes a no-hassle, solder-free Acoustic Matrix undersaddle pickup in a narrow or wide format option.State-of-the-art onboard preamp featuring Fishman"s Aura Acoustic Imaging Technology Up to four Aura Images can be downloaded from Fishman"s Aura Image Gallery software (included) Ergonomic soundhole-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 soundholes from 3-7/8" to 4-1/8" in diameter Pickup/image blend control Volume control Phase switch (feedback control) Automatic anti-feedback Low battery indicator Solder-free Acoustic Matrix Undersaddle pickup in narrow or wide formats Switchable Natural I and Natural II low-frequency tone shaping built into the preamp