The difference between the new version 1860B and the old version is: 1. Newly added 5.1 Bluetooth wireless reception (does not support transmission) 2. The screen backlight is changed to orange (more beautiful) 3. Optimize the physical operation of the buttons (more tactile and responsive) 4. The color of the shell is changed to BMW gray (customized paint, the color is beautiful and atmospheric, and it is not easy to fade). Product parameters: AC/DC converter AC input: 220V50HZ DC output: DC7V/500MA DC plug: inside positive outside negative (outer diameter 4.5mmx inner diameter 1.75mm) 4 AA batteries (need to bring your own) Headphone socket 3.5mm 32 ohm Left/Right per channel: 300mv/4.7K Diameter 76m 16ohm/0.5W Dimensions: 168x104x30mm Weight: 350g Operating temperature range: 0 degrees Celsius to +40 degrees Celsius Operating temperature: 35% to 80% relative temperature (non-condensing). FM range/tuning step 1. FM: 87.5-108.0MHZ; (China) 0.01MHZ/0.1MHZ. 87.0-108.0MHZ; (USA) 0.01MHZ/0.1MHZ. 64.0-108.0MHZ, (Russia) 0.01MHZ/0.1MHZ. 76.0-108.0MHZ; (China Europe) 0.01MHZ/0.1MHZ. Long wave (LW): 150-285KHZ intelligent stepping 1KHZ/3KHZ. Aviation band (AIR): 118-137MHZ intelligent step 1KHZ/25KHZ. Amateur Radio: (SSB): LSB/USB? Bluetooth receiver: 2.4GHZ, Ver5.1 2. Storage memory: 700 in total 3. Speaker specifications: diameter 76mm, 16? , 0.5W 4. Headphone specification:? 3.5mm/32? Stereo 5. Audio input/output:? 3.5 stereo.