211).8-level adjustable NIXIE tube bright with Auto-brightness feature (it is ableto adjust the tube brightness depending on the current environment).12).Rechargeable Backup Battery or Farad capacitor keeps RTC running during poweroutages.13).Tri-colored RGB LED mounted under the each NIXIE tube. These LEDs can displaydifferent colors at the same time, with a lot of pre-defined auto color change effects.14).Store user settings in non-volatile memory.15).Beautiful CAD designed acrylic case made using a laser cutter makes the clocklook beautiful. You can assemble/disassemble the case by using only 4 screws on thebottom of the case. The case also has 4 bumpers as feet on the bottom of the casein order to stop to prevent case's damage.16).Can install Temperature Sensor(optional) ;Can install 433M wirelessmodule(optional) for receiving the outside info, like the wireless temperaturesensor's data and the GPS time sync data, etc.Turn Power ON/OFFWhen you plug the MINI-USB with power supply to the clock, the clock will turn onautomatically, with NIXIE tube displays current time with the LED running in breathingmode.In this mode ([Time display mode]), press and keep the [+] and [-] button down thensingle click the [SET] button, you can turn the clock [soft power on/off]. When youturn the clock power off, the HV supply will shutdown, and the LED will turn off,but all the Alarms and Auto Power ON/OFF and RTC functions will still be running;*Let the clock face to you, the left button is [SET], and the middle button is [+],theright button is [-].Tips: When you turn the clock [Soft power Off], and you want to peek the time, youcan just need to single click the [+] or [-] button, the clock will turn on for about4 seconds and will turn off automatically. And if you want to turn the clock on fromthe [Soft power Off],long click any keys for at least 2 seconds the clock will turnon, then you can release the key.Turn LED ON/OFFIn [Time display mode], single click [SET] button will switch the LED in Play/Pause/OFFmodes.Tips: You can control the LED(s) individually, even in the [soft power off] mode.