Model Number: IC-M304 Item Type: Speaker Origin: Mainland China Description Report Item Waterproof grade JIS-7, no water entering for 1 meter and 30 minutes under water; Large font display on the screen, adjustable 4-level backlight; Channel collection function, which can quickly select common channels; Automatic water removal function: send out vibration sound, which can shake out the accumulated water on the horn grid and make the received sound clearer; Dual-frequency/triple-frequency duty function; No DSC function; Made in Japan with quality assurance. Transmission frequency (MHz MHz) 156.025~157.425 Receiving frequency (MHz MHz) 156.050~163.275