Harrison 40 channel AM/FM (26.965 MHz to 27.405 MHz) CB radio features 12-24 volt operation, built-in USB port (5V 2.1A), 7 weather channels with alert, frequency display, automatic SWR, rotary channel switch, Beep function, Roger Beep, Talk-back, Tone control, volume adjustment on/off, manual & auto squelch, multi-fuction LCD display, Digital S-meter, hands free VOX operation, NRC (noise reduction), Noise Gate, ANL/NB/Hi-Cut filters, CTCSS/DCS, channel scan with skip function, 2 emergency pre-sets, F-function key, keylock, rear speaker and PA jacks. 6 pin front mount Electret/Dynamic microphone with up/down channel  buttons. Approximate radio dimensions: 4.92 x 6.49 x 1.77 inches 125 x 165 x 45 mm.