Accessory Type:Extension Board Compatible With:Digital Clock Kit durable. Adopt imported high-precision clock chip, the error rate is extremely low. The integrated display unit of the application is more stable and more reliable. Using stm8s005 as the control core, internal welding procedure of the light pipe can be used directly. 12/24hours Display model, can be set every 1~9 mins refresh display, no alarm. Input: 11-13V Battery: CR1220 (not included) Weight: approx. 36.5 g Just a Circuit board(PCBA) No Nixie Tubes Just need solder tubes and supply power, it can works It is easy to use Introduction: Input:- USB 5V(4.7v~5.5v)1A Use good timing IC Apply to IN14 QS30 IN12 Nixie Tube Can set automatic close light at night(22:00~07:00 close, 07:00~22:00 automatic open light. ) Function:12/24hours Display model,can be set every 1~9 mins refresh display,No alarm. Backup battery module : CR1220(not supply) colour:blue Material:Metal +pc size:110*44MM Package Contents: 1* motherboard 7* cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.