Lento 10 Support Page

Please take a look at the sections below to find the answers you’re looking for. 

 

If you can’t find what you’re looking for or have additional questions, please don’t hesitate to contact us. We’re always here to help!
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Last updated: June 2025

Installation

How to Install with 3M Tape

Simple instructions for 

installing with 3M Tape

Read Article

Where to Install

Tips for choosing the best place to install your smoke alarm

Read Article

How to Install with screws

Simple instructions for 

installing with screws.

Read Article

Other

Cleaning, testing & maintenance

Information on how to clean and maintain your Lento smoke alarms.

Read Article

Deep Cleaning & False Alarms

How to deep clean your smoke alarm & fix false alarms

Read Article

Click here to register your product warranty

Frequently asked questions
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How to activate and install smoke alarm?

Read the above articles for screw & tape installation. Generally, tape installation is the easiest and most applicable.

Link to tape installation article.

Link to screw installation article.

 

Further guidance:  In order to the smoke alarm to get power from the battery, the little "power switch button" sticking out of the rear cover MUST be pressed down. Normally this is done by turning the mounting plate far enough on the clockwise direction (i.e. until you hear/feel a few clicks that are created when the “ 4 rear cover hangers/brackets” are moving on the ridged area of the mounting plate. Please see the photo included in linked video on how far the mounting plate must be turned in order it to press down "the power switch button”.  Please also note that the last bit of turning may be a little difficult, so don’t stop turning when it gets a little hard - that is exactly the point where you have to turn a little bit more in order to activate the product. If you have not yet attached the mounting plate on the ceiling, you can also use e.g. screwdriver as a tool to aid the turning of the mounting plate (if it feels too tight): Place the screwdriver head on the screw hole, and use the screwdriver as a tool to get more power for the turning of the mounting plate.

My smoke alarm keeps activating false alarms, how do I fix this?

This article on deep cleaning the smoke alarms will fix this in almost all cases.

 

When  a smoke alarm gives a false alarm, or 3 small beeps either regularly or irregularly, or one small beep irregularly, it is always due to something disturbing the optical smoke sensors inside the product. Most often this is a tiny dust particle that has got inside the product, but it can also be a small insect (most often a tiny spider) - or of course some visible disturbance (e.g. vapor or fumes from bathroom or cooking) could also be the cause.

 

If the problem doesn't resolve after deep cleaning, don't hesitate to contact us for support.

My smoke alarm is beeping, how do I replace the batteries?

Please note that new Jalo Helsinki Kupu 10 and Lento 10 smoke alarms have a fixed, non-changeable, battery that is expected to last over 10 years. If your smoke alarm has replaceable batteries, it has to be Original -series model, either Kupu Original or Lento Original. in such a case, please check the instructions under the correct product heading.

If your Kupu 10 or Lento 10 product beeps, please check how it beeps:

- One small beep "once in a minute”?

- 3 small beeps ”once in a minute”?

- Continual, louder alarm signal?

In the first case (one small beep once a minute), the beep is likely to be related to the battery getting empty, and it is time to change the product to a new one.

In the two other cases (3 small beeps once in a minute, and continual louder alarm signal) its is likely that some tiny dust particle or a small insect has gotten inside the smoke alarm smoke detection chamber, and the smoke alarm needs vacuum cleaning. Please check the vacuum cleaning instructions by clicking the product picture above, and then navigating to the correct instructions for the product.

What to do when the alarm gives short temporal beeps right after installation or after pressing the test surface?

Beeping should stop in 10 minutes. However, if the beeping doesn't stop in 10 minutes after installing the alarm, there could be something wrong. In this case please check the question 1 for smoke alarms Kupu 10 and Lento 10, and if the guidance given in there does not help, please contact the manufacturer/distributor in order to receive further guidance.

Are the wired versions of Jalo Helsinki smoke alarms coming onto the market soon?

The wired version is currently in progress, we will inform you in the website when it is available.

Is it possible to install battery operated smoke alarms into new-build houses?

In some countries there are requirements that the new build houses must have at least a certain number of hard-wired smoke alarms. Typically the requirement is to have 1 hard-wired smoke alarm per 60 sqm per floor. On top of these hard wired models, one can install additional battery operated smoke alarms into new-build houses to provide enhanced safety. Whether all the installed smoke alarms can be battery operated, please check from the fire safety officials in your country.

Where can I purchase Jalo Helsinki smoke alarms?

The easiest way to purchase Jalo products is through our online store.

Can the smoke alarms be wall-mounted?

Both the authorities and we strongly recommend that the smoke alarms be placed in the middle of the ceiling, where they are at their best to detect the potential smoke in the room.

 

However, if you really want to install the smoke alarm on the wall, that can be done - just place the smoke alarm as high on the wall as possible. Also please bear in mind that wall installed smoke alarm will react slower to the smoke as the smoke density will first build-up on the ceiling, and only later will start building up lower - finally reaching the wall installed smoke alarm as well.

Why is there a red light blinking regularly in my smoke alarm? Can I take it off?

The light indicates correct functioning of the smoke alarm and currently it can not be turned off in Jalo smoke alarms. However, in 10 series models (Kupu 10 and Lento 10) the red light is blinking only once in every six minutes, and the light intensity is very low - especially in the Kupu 10 products where the light appears through both a plastic front cover and a fabric cover. Therefore, it is actually rather hard to notice the blinking, and we have received no information that the blinking in 10 -series smoke alarms would be bothering e.g. in the bedroom.