Go to Support section and download the software for Mac or PC. After installing the software, connect the watch to your computer using a cable that came with the watch. Then the watch will be activated automatically and you will be able to use the installed software to adjust the watch settings.

Download the software and connect the watch to your computer, then go to the settings menu – see our video tutorial.

Press and hold the button for 5 seconds until the digits start flashing – see our video tutorial.

You need to calibrate the quartz crystal. First, connect the watch to the software, wait longer than 5 minutes, then turn the watch off and repeat the same cycle in 10-12 hours. If the problem returns, repeat the same procedure.

Keep charging the watch until the flashing LED changes from red to blue or green. Do not keep the watch on charge for more than 16 hours!

The rechargeable battery retains the charge for 7-10 days of daily use. You may need to replace it after a few years of use, as these batteries tend to degrade over time. Replacement batteries are available.

The case is made of 316L stainless steel, which is used by all high-end watch brands. This type of steel is scratch-resistant and does not corrode, and you can also polish it when servicing your watch.

The crystal has a scratch-resistant and anti-reflective coating. We also use heat-strengthened glass, which is virtually scratchproof and impact-resistant.

Please report your problem to ilya@gelfman.ch, and we will help you solve it.

So far we haven't received any reports of people having problems getting through airport screening while wearing their IN-16 Nixie watch. All the internal components are visible to the security personnel, so it's easy to inspect.

The Nixie tube is one of the oldest and retro-futuristic of all digital display technologies: a glass tube containing a wire-mesh anode and multiple cathodes that, when powered, become glowing orange numbers from 0 to 9. In our watch, we used the original retro Nixie tubes from the Cold War era.

IN-16 nixie tubes have a lifetime of 10,000 hours, which means that your indicators will last for more than 10 years if you’re using your watch regularly.

Yes, in our watches we use modular design for the nixie tubes.

Yes, you can. We recommend to use a brand portable power source as the charger, with the charging voltage of DC 5.0 V.  Please note: There may be an issue with the portable power sources, since they can't fully charge the watch because most of them have an automatic shut-down function at full energy.

Do not use a fast charging adapter because it may damage the watch in the long run.

We provide a one-year warranty on all our products (including the Nixie Tubes). If you discover any defects or a breakdown within the warranty period, we will have your watch repaired or replaced if necessary.

Your warranty is activated when you connect your watch to your computer for the first time.

Unfortunately, there is always a risk of damage during the shipping. And even the best packaging would not withstand certain circumstances. Please note, that you acquire ownership of the watch and take full responsibility for the risks associated with the watch from the moment when the watch is delivered to you by the shipping company. The shipping company is responsible for notifying you of the arrival of your item.

All visible defects of the watch shall be checked by the shipping company before shipping the watch. You need to visually inspect the watch at the moment of receiving it from the shipping company.

Our watches are non-refundable, but if you discover a malfunction, please contact our customer service at ilya@gelfman.ch