Adaptive digital signal processing algorithms incorporated in a state-of-the-art open design. Feature Summary: Exclusive, Lightweight Design contours the top of the ear between the head and pinna to provide maximum comfort. Unique Earbud Design In Four Sizes to provide open-ear with excellent retention and reduced feedback. MultiChannel Programmability as WDRC or Output Compression Limiting with multiple parameters to optimize fine-tuning of the response. MultiChannel Expansion technology reduces circuit and low-level environmental noise typically associated with WDRC hearing aids. Adaptive Noise Management reduces gain of steady-state noise only in channels where noise is detected. Feedback Management reduces feedback at use settings. Real Ear Insertion Gain View within PFS simplifes fitting. Five Tubing Lengths to meet the needs of a variety of patients. Programmable Indicator Tone for low battery. Appealing Translucent Case in blue-tinted charcoal gray allows Aspect to blend in with the shadow of the pinna. Size 10A Battery.