Circuit board size: 7.7CMX6.1CM; Shell size: 8.4cm*6.8CM*5.2CM (old model) 8.4cm*7.6CM*5.5CM (new model) Working voltage: DC 5V DC (positive inside the DC socket and negative outside, do not connect it reversely) FM range: 87MHZ-108MHZ; Frequency modulation button: Press the button once for 0.1MHZ, long press the FM button for continuous addition and subtraction; Weight: new parts + speaker + screws = 115G + shell = 185G + power supply = 265G Old parts + speaker + screws = 115G + shell = 181G + power supply = 260G Functions: digital display frequency function, power-off memory function, power-saving function; Power-off memory function: After turning off the power and powering it on again, the radio station before the power-off will be played. Power saving function: 1. Each time the power is turned on or the FM key is pressed, the digital tube displays the frequency for 5 seconds, and the digital tube display will automatically turn off after 5 seconds. 2. Reasons: (1) Power saving (2) The digital tube will interfere with the sound when it is displayed. Turning off the digital tube will reduce the interference.