Electrical Parameters:- Use a 3.6v lithium battery- Support USB charging- Audio output supports headset 3.5MM- Support 8-ohm speaker 1W 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 compatibleFeatures of This Sketch: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).Attention:- If you modify the parameters, please refer to the actual product.Package Included:- 1 x Set of Radio ReceiverNote:- It is assembled and ready to use.