AMICO is based on a Class D amplifier, with a wide band frequency response and minimum distortion. It provides a natural and comfortable sound. The four trimmers (plus the MH control on the switch) permits a great flexibility in meeting the individual needs. Special Features: Class D Amplifier. Highs Cut, Lows Cut, Gain Control and AGC continuously variable. High immunity microphone for reducing electromagnetic interference. High sensitivity telecoil. 3 positions switch, available in 2 versions: T-MH-M (standard) or T-MT-M (upon request). Battery type 13; low consumption.