There are no indicator lights on the K400 to tell you when your batteries are going down, but there is really no need for it.  Logitech claims that the K400 sports an astounding full year of battery life on just 2 AA batteries.  Obviously I did not have a full year to put this claim to the test, but

Logitech, grand équipementier du secteur informatique est reconnu depuis de longues années pour ses périphériques souvent de très bonne qualité. Nous allons vérifier si sa réputation est toujours d'actualité avec le Wireless Touch Keyboard K400.

Très compact; Pas de configuration; Pas de logiciel à installer; Légère; Fonctionne sous Windows/Linux

Pas assez de touches de raccourcis

Very good except for the Right shift key, it is small. The up arrow key is where the shift key should be and as a result I keep hitting the up key and it messes up my typing.It is a Frustrating oversight on behalf of Logitech. It is not a primary keyboard so I will keep it.

Compact; Easy To Set Up

Uncomfortable Design

You can pair the keyboard with other Logitech devices with Unifying receiver technology. No more multiple receivers. Well worth the money.

Take up very little space compared to full keyboard, yet functions big like full keyboard; With its integrated touch pad, you can easily control your HTPC from a distance, and you dont lose function keys like some tiny HTPC keyboards

None; Very satisfied with the purchase; Except that Im still used to mouse instead touch pad; Nut for HTPC control, you are not going to use a mouse, do you

I use a laptop as my entertainment hub and using this keyboard as remote. I no longer use a mouse so the built in track mouse is the main reason I bought this model. Because of it's small size it can be a bit clumsy to hold on to if using for anything more than simple commands

wireless; touchpad mouse

so far nothing

At first I had a bad surprise because when used in french where not working properly... But this is just because the pre-installed script for french keyborad on my mini PC is not the proper one ( took me 2 hours to find it and there is 4 or 5 in french!

Light; Quite reactive; Inexpensive

None so far

We've used this for years now and it still performs well. Perfect for children as the keyboard is perfect for small hands. Easy to pair and batteries last a long time. As soon as my child outgrows this I'll likely either give it to someone with small children or pair it to some wireless device I...

I wanted a keyboard to use as a remote controller when my laptop is connected to the tv. This keyboard is exactly what I was looking for. It's easy to use , the response is perfect the mousepad works very well. I can't really see anything wrong about it.

Compact; Durable

Just got an android mini PC and figured that the K400 would be the perfect keyboard. Thought wrong. The K400 does not support Android. Returning to Office Depot.

It's smaller than my old one, which I like and I love the mouse pad being on the keyboard. The only thing I dislike is the right shift key is too far away.