Amplify faint or distant sounds with our Bionic Ear and Booster Set. Listen by pointing the unit in the direction of sounds up to 100 yards away. The set comes with a 12" parabolic dish and has a recorder out put jack to record the sounds picked up by the Bionic Ear. Specifications Frequency response of 100-10KHz Gain amp cut off at 90dB Amplifies sounds by 40 dB Independent volume controls on headset Output jack to record sounds Line in jack impedance of 10V maximum -46dB Mic sensitivity 40 hour battery life 9V battery (not included) Includes Head phones Size 16 x 12 x 5