Upgraded solid capacitor, mini size. (14.5x6cm) 150-250Hz refresh rate (depends on different interface) The menu can set clock mode, terminal, function generator, calibration, demonstration, etc. (currently only using clock mode) There are 37 different combinations of digital dials, Roman dials, binary dials, simple dials, and other modes. Onboard LED can display Morse code Automatic daylight saving time correction Screen anti-aging function Multi PPS selection Multi clock interface, date, time, clock, week, stopwatch, customized character display, etc. Connected to 8SJ31J by default, support for 7SJ32J, 5SJ38J, 3SJ1J tubes and so on. Note:Oscilloscope clock is not included. Colour:Black Material:Plastic Package Contents: 1 x Controller Board 3 x cable(The color appearance will be sent randomly, no specification will be accepted, and it will not affect the use)