The -25 encoder is used, which has a long service life and a better handle.Added FM amplifier and M filter.Use the knob cap of -25.Added TYPE-C socketSupport audio output Support 3.5mm headphonesUse 3.6v lithium batteryUSB chargingSupport 8 ohm speaker 1wFM output supports headphone antennaUse BNC antenna interfaceThe pcb retains the si4735 package, the user can replace the chip by himself, and the software is compatibleFeatures of this sketch:1) fm, am (MW and SW) and SB (LSB and USB);2) 0.5, 1, 1.2, 2.2, 3 and 4khz audio bandwidth filters;3) 22 pre-configured commercial radio and ham bands;4) BFO control; and5) Frequency step switch (at 1, 5 and 10kHz);Type: Radio ReceiverColour:blackMaterial:MetalPackage Contents:1 x receiver1 x antenna1 x data cable1 x mirror cloth1 x Corner padOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.