1Improved frequency range and adjusted frequency interval make it easier to switch the channel. 2Added squelch function to achieve squelch when no calls are made. 3The performance of the aeronautical receiver has a new leap with improved sensitivity. 4Support to connect power amplifier and other external equipment. 5Used to receive air-to-ground and air-to-aircraft radio calls. 6Air band radio is of low power. Please be patient when looking for the frequency. Item Type: Receiver Band Range: 118-136 MHZ Mode: AM Power Supply: 2 x AAA batteries (NOT included) Usage: Insert the earphone (self-matching) into the headphone jack and turn on the volume/switch knob, then extend the earphone cable and adjust the frequency dial (aim at the blue dot) to select the desired aviation radio band. Notes: 1. Avoid all kinds of interference sources (generator/switch power supply/computer/transmitter, etc.) when using. 2. Adjust the volume to an appropriate position to protect the hearing. 3. Try to extend the earphone cable when receiving at a distance to prevent the earphone cable from shaking and causing poor reception. 4. Airline-band signals are transmitted in a straight line, and should be used in outdoor open areas or high places as far as possible. 5. When flying, please follow the regulations of your local airline. 6. Air band radio is of low power. Please be patient when looking for thefrequency. 1 x Aeronautical Receiver