Hearing Aid Digital Circuit with 3 Hearing ChannelGENERAL FEATURESTechnology : Digital circuitType : Behind the ear (BTE)Number of hearing channels : 3Full-on Gain (FOG) : 0dB to 110 dBVolume control : YesProgram button : NoSwitch (Body worn) : NoFitting range : 30dB to 120dBFrequency range : 250Hz ..