Description: The bands received by this machine include FM (this is to receive the social channel), and MW (this band is divided into countries and regions. North American countries use 10KHZ MW steps, and European and other countries use MW steps. The value is 9KHZ), with short-wave SW (the main propagation path of this band is sky wave, please go to the balcony or window for receiving and audition), with aviation band AIR For the aviation band of the 737 radio, you can set SQ ON to be in silent modes, or you can set SQ OF to be in non-quiet modes. When the user does not know that the nearby air frequencies can be received and needs to search by himself, please use the SQ OF modes to search. When a signal is found, you can use SQ ON to remove the radio sound of the radio. The aviation band of the 737 radio has requirements for the receiving distance, generally, it needs to be within a range of ≤20 kilometers near the airport VHF civil intercom band, this is the need for nearby people to use a transmitter such as a walkie-talkie to receive the signal with 737 Specification: Portable aviation band radio off-road hobby VHF channel receiving multi-function full-band radio AM, FM, SW full-band radio, telescopic rod antenna LCD display with backlight, replaceable built-in lithium battery, longer radio life Model: HRD-737 Rated voltage: 3.7V lithium battery Material: ABS Dimensions: 103X60X15MM Battery Specifications: 650MAH Weight: 220G Applicable crowd: radio enthusiasts, aviation staff Package Includes: 1 Piece Radio 1 Piece Headphone 1 Piece Charging Wire 1 Piece Extended Antenna