Features:  1) FM, AM (MW and SW) and SSB (LSB and USB);  2) Audio bandwidth filter 0.5, 1, 1.2, 2.2, 3 and 4Khz;  3) 22 commercial and ham radio bands pre configured;  4) BFO Control;  5) Frequency step switch (1, 5 and 10KHz);     Specification:  Use a 3.6V lithium battery 1000MA(only for Assembled version).  Support USB charging.  Audio output supports headset 3.5MM.  Support 8 ohm speaker 1.5W output.  FM supports earphone antenna.  Antenna interface uses BNC.  The PCB retains the SI4735 package, users can replace the chip by themselves, and the software is compatible.  Band band[] = { {FM_BAND_TYPE, 8400, 10800, 10430, 10},  {LW_BAND_TYPE, 100, 510, 300, 1},  {MW_BAND_TYPE, 520, 1720, 810, 10},  {SW_BAND_TYPE, 1720, 3500, 1900, 1}, // 160 meters.  {SW_BAND_TYPE, 3500, 4500, 3700, 1}, // 80 meters.  {SW_BAND_TYPE, 4500, 5500, 4850, 5},  {SW_BAND_TYPE, 5500, 6300, 6000, 5},  {SW_BAND_TYPE, 6300, 7800, 7050, 5}, // 40 meters.  {SW_BAND_TYPE, 7800, 10000, 9600, 5},  {SW_BAND_TYPE, 10000, 11000, 10100, 1}, // 30 meters.  {SW_BAND_TYPE, 11000, 12500, 11940, 5},  {SW_BAND_TYPE, 12500, 13900, 13600, 5},  {SW_BAND_TYPE, 13900, 14500, 14270, 1}, // 20 meters.  {SW_BAND_TYPE, 14500, 15900, 15300, 5},  {SW_BAND_TYPE, 15900, 17900, 17600, 5},  {SW_BAND_TYPE, 17900, 18300, 18100, 1}, // 17 meters.  {SW_BAND_TYPE, 18300, 21900, 21200, 1}, // 15 mters.  {SW_BAND_TYPE, 21900, 26200, 24940, 1}, // 12 meters.  {SW_BAND_TYPE, 26200, 27900, 27500, 1}, // CB band (11 meters).  {SW_BAND_TYPE, 27900, 30000, 28400, 1}}; // 10 meters.     Package includes:  1 x Host with shell+Antenna (Battery included).  OR 1 x Finished board+Speaker+Antenna (Battery not included)