OTE Digital Hearing Aids - Push Button Volume Control. Condition is New. Shipped with USPS First Class Package. - 100% Digital processing for exceptional sound quality - 2 channels WDRC amplifier - 12bands frequancy shaping - Low level expansion - Low battery warning - Earhook design, easy operating - Memory switch tone - Rocker volume control - Low frequancy cut trimmer - MPO trimmer - Output Compression Limiting(AGC-O) - Low current consumption Housing Design:...........BTE Peak OSPL90(dB SPL):......134 OSPL90-HFA(dB SPL) :......127 Peak Gain(dB):............60 HFA/FOG(dB):..............50 Reference test gain(dB):..50 Frequency Range(Hz):......200-4200 EQ input noise(dB):.......23 Battery Size:.............13A Battery Current(mA):......0.86