Feature:  Input voltage: DC 5V;  Operating current: 220mA maximum;  Fluorescent tube model: IV-18 (ИB-18 1984-1992 manufactured by the former Soviet Union);  Dimensions: 200mm x 52mm x 64mm (L x W x H) fluorescent tube length 115mm diameter 18mm;  Working temp: 0°C - 60°C;  Net Weight: 350g;  Shell material: Aluminum alloy;    Functional features:  1. Eight digits in IV-18 (ИВ-18) VFD tube display. (~1980-1992 made in USSR).   2. Display hour, minute and second (12 or 24 hour format optional).   3. Display year, month and day and Chinese lunar date (YY-MM-DD or MM-DD-YY.DD-MM-YY.YY-DD-MM format optional).   4. Leading zero ON/OFF function.   5. GPS real-time adjustment. Automatically  adjusts  date  and  time; GPS status display (package does not includes GPS).  6. GMT time zone functions, the clock will calculate the local time based on satellite.    7. Temperature display (°C or °F) (with optional temperature sensor).  8. Two alarm clock (set ON/OFF independent alarms).  9. Alternating, date and temperature display. Adjustable display intervals.  10. Timer function. Can be set up to 99 hours, 59 minutes and 59 seconds.  11. Display ON/OFF timer. Easily check time and date after when powered off.  12. 8 manual brightness levels; auto brightness for ambient conditions.  13. Sound ON/OFF button.  14. Display information auto-rotates 180° based on clock orientation.  15. IR remote controller operation.  16. Extremely precise RTC module provides accuracy less than 1 minute/year.  17. Built-in backup lithium battery will maintain clock time more than 3 years.    Package includes:  1 x Set of metal housing accessories (including all metal fittings and screws used in the assembly of the housing);  1 x Set of semi-finished PCB boards (all patch components have been soldered using a mounter);  1 x Set of electronic components (need to own DIY soldering);  1 x IV-18 fluorescent tube;  1 x Infrared remote control;  1 x MiniUSB cable (1.2M long);    Note: GPS receiver is not included. Instructions please download the electronic version which is at the top.