The coronavirus pandemic clearly showed us that even modern highly-developed medicine cannot prevent disease outbreaks. Germs have always been a part of our lives, causing harm sometimes but for the past 30 years the frequency and diversity of disease outbreaks grew steadily and the number is expected to keep growing even more, making the constant fight against viruses and bacteria the norm of our life.

That is why with the idea of protecting the special ones, we are happy to introduce our new product Sterly – a compact disinfector that you can bring anywhere in your pocket or purse. Door handles, toilet flush button, restaurant cutlery, public transport handles, phones and what is more important – masks – will not become anymore a threat to your health. With our effective and portable 265nm UVC torch you spend only 5-20 seconds to disinfect the item and inactivate 99,9% of germs on it. Specifically designed to be used anywhere and anytime, mercury-free Sterly is instant, small and convenient to fit your pocket or purse. Sterly – device that will become an irreplaceable item when you do things outside home.




Why is Sterly superior?

    • Inactivates 99.9% of microorganisms in seconds. Sterly is a high-powered LED with 60mW, emitting 265nm UVC light which is the most efficient against viruses and bacteria. 

    The following graph shows the effectiveness against commonly found harmful germs with different wavelengths. It shows UVC range from 260 – 270nm is the most effective.

    Source: Klaran


    • Multi-functional. Sterly can be used not only for masks and phones, but also for different surfaces and environments, due to its compactable size and strong power.

    • Disinfection in seconds. With this 60mW UVC LED, it takes on average 3 – 7 seconds to kill germs.

    Source: Klaran

    • Convenient. A torch-designed device is portable and convenient enough to carry it in your pocket, bag or purse. It is one of the lightest and smallest among all UVC sterilizers. 

    • Torch design for optic focus. Reflective lenses are used to concentrate the UVC light to the intended area of disinfection, significantly increasing (6.5 times) the efficiency of inactivating germs and decreasing the chances of unwanted UVC exposure.

    • Mercury-free. Our product does not contain toxic mercury unlike other UVC lamps. Instead, we used a new LED chip technology that is not harmful if the device is broken, making it more environmentally friendly for disposal.

    • No warm-up time needed. The device functions at once when you switch it on. 

    • Easy to use. A bright, visible pilot LED light is designed to merge with the invisible UVC LED. You can easily see the area that you already disinfected.

    And finally, it is 

    • Japanese made. Our device has a high-quality Crystal-IS/ Klaran LED, manufactured in Japan. Its quality is guaranteed. The body manufacturer is LUMICA, a japanese company with 41 years experience of manufacturing goods.

    • Environment friendly

    Sterly can dramatically decrease the consumption of one-time use disinfection products and therefore reduce waste and pollution. (photo of used masks in sea/ dumpfill)

    • No chemical residue

    Some sanitizing chemicals can be giving unpleasant smell, irritating to skin, eyes or causing allergies, Asthma for some individuals. Sterly, on the contrary, with UVC technology is much more friendly to use.

    • Patents pending

    Sterly is the first Torch/flashlight designed device. Our team strikes an intelligent and sophisticated balance between power and convenience(size) to ensure it is easy to use. The internal design of Sterly concentrates the UVC energy to the intended area, where the energy increases 6.5 times, and gets rid of all unwanted dose to the surroundings or UV leakage.


Recommended disinfection applications

  1. Masks. Wearing a mask in everyday life, you encounter multiple situations where you need to take it off and then wear it back, exposing yourself to the danger of viruses and bacterias, collected at the outer side of the mask.  

  2. Phones. Touching our phone ___ times per day, its surface contains a large number of different bacteria.

  3. Restaurant utensils disinfection. You aren’t sure if the restaurant cutlery is well-disinfected, our UVC Torch will help you to get the germ-free cutlery. 

  4. Public places disinfection. Door handles, toilet flush buttons, handles in public transport or even the seats in a plane for long hours – all these you can disinfect with our UVC torch

  5. Money. Money can carry viruses, protozoa, and bacteria. Depending on where it’s been, it could carry almost anything. 

  6. Kitchen utensils. One of the greatest sources of germ in the kitchen is the cutting board. Its surface can trap foodborne bacteria and become much harder to clean with simple water and dish soap. Applicable also for knives, stoves, cups, sponges, etc.

  7. Bottles. To prevent germs from reproducing, sometimes only water is not enough. According to Brazilian research, used only once, 83% of bottles had signs of bacteria contamination. The UVC torch can be used also on baby milk bottles to ensure a more reliable result. 

  8. Pets toys and bowls

  9. Electronics. Phone, tablet, keyboard, mouse, earphones, remote control and other devices.

  10. Food. Dozens of people touch the food before you buy it. Germs live on the surface for many hours after and you may never know what bacterias are on that chocolate bar cover. 

– children toys;
– accessories;
– toothbrushes and makeup tools;
– shoes;
– steering wheel.



  • Product size: 3.3cm X 10.9cm (product photo)

  • Weight:  70 g (with batteries)

  • Battery: 3 AAA batteries

  • Wavelength: 260-270nm

  • Optical Power: 24-30 mW

  • Operating temperature: -40 to 100

  • Material: plastic, ____, ____

Disinfection time

In accordance with the CDC article on Decontamination and Reuse of Filtering Facepiece Respirators, the UVC light kills different microbe, which are:

  • Influenza A (H1N1)

  • Avian influenza A virus (H5N1),

  • Loenza A (H7N9),

  • A/Anhui/1/2013

  • Influenza A (Hw pathogenic

  • Influ7N9),

  • A/Shanghai/1/2013

  • MERS-CoV (coronavirus)

  • SARS-CoV (coronavirus)

  • H1N1

  • Influenza A/PR/8/34

  • MS2 bacteriophage

Our pocket UVC torch was specifically created to disinfect the surface and eliminate 99.9% of microorganisms, on average, 10 seconds.—Application-Note—AN013.pdf

Image source: Klaran


How is Sterly effective against the COVID-19?

The effects of UVC dose, viral nucleic acid type (single-stranded RNA, ssRNA; single-stranded DNA, ssDNA; double-stranded RNA, dsRNA; and double-stranded DNA, dsDNA), and relative humidity on the virus survival fraction were investigated. For 90% viral reduction, the UV dose was 1.32 to 3.20 mJ/cm2 for ssRNA, 2.50 to to 4.47 mJ/cm2 for ssDNA, 3.80 to 5.36 mJ/cm2 for dsRNA, and 7.70 to 8.13 mJ/cm2 for dsDNA. For all four tested viruses, the UV dose for 99% viral reduction was 2 times higher than those for 90% viral reduction.

Scientists now are still studying the properties of COVID-19. What we know is COVID-19 is a coronavirus,  hence we can estimate how much dose needed to inactivate it. COVID-19 is ___, hence, the UVC dose needed to inactivate COVID-19 are similar to other coronaviruses. 

SARS-coV-2 contains ss-RNA and Sterly needs 3sec to inactivate ssRNA virus within 5cm distance.

For 90% viral reduction, the UV dose was 1.32 to 3.20 mJ/cm2 for ssRNA,the UV dose for 99% viral reduction was 2 times higher than those for 90% viral reduction.

with a radiation peak at 253.7 nm

with a 254-nm sensor.

2.64 to 6.40mJ/cm2


Further Studies

According to Scientific Committee on Health, Environmental and Emerging Risks (SCHEER) Health effects of UV-C lamp radiation Final version 2017

  • No quantitative data on dose-response of stochastic effects such as skin cancer or ocular cancer.

UV-C wavelengths are being absorbed at the surface of the cornea and UV-C-is concentrated in the corneal epithelium. It does not penetrate deeply beyond this corneal layer. 

The picture shows us that the isoparametric transmission contours less than 10% of the radiation at UV-C wavelengths reaches depths below the upper two skin layers. 

UV-C is highly absorbed by chromophores in the outer layer of the epidermis. As an example, only 5% of incident 254 nm UV-C reaches the top viable cell layer. 

In conclusion, a 265nm UVC light will be mostly absorbed by dead cell layers.


UV-C is mostly absorbed in the hornylayer of human epidermis. Both histopathological and genetic investigations show alterations like CPD formation and gene modulations induced by UV-C. UV-C exposure resulted in basal CPD formation where the epidermis was thinned even at low doses below the threshold of bacteriostatic effects.

UV-C from solar radiation is effectively filtered by the ozone layer and there is normally negligible exposure to UV-C from the sun on the earth’s surface. Artificial UV-C radiation has been shown to induce erythema inhuman skin. The time course of UV-induced erythema appears not to be significantly different between UV-C and UV-B radiation. However, the dose response curve for UV-C erythema in human skin is less steep than for UV-B. As the mechanisms for DNA damage at molecular level are comparable to those known for UV-B, UV-C is considered carcinogenic.




  • UVC LEDs emit high intensity ultraviolet light. Handle with care.

  • Do not look directly into the UVC light source or point the light at the skin. It can be harmful to your eyes and skin.

  • It is recommended to wear protective eyewear to avoid exposure to UVC light, as well as protective masks and gloves, etc. in order not to expose your skin to the light. Also take sufficient safety measures against light leakage, etc., in order to avoid any influence on the human body.

  • Keep out of reach of children.


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