Samsung has unveiled a smartwatch with a colour screen that can show alerts, be used for voice calls and run apps.
The Galaxy Gear had been highly anticipated since the firm is currently the world's bestselling smartphone maker and has beaten Microsoft, Apple and Google to unveil such a device.
Samsung called it a "fashion icon".
However, analysts warned that a decision to limit the watch to working as an accessory to other Galaxy Android devices might limit its appeal.
It unveiled the the watch - which will go on sale from 25 September - at the Ifa consumer tech show in Berlin.
"Consumers might be a bit disappointed to find that the smartwatch is a partner device reliant on being paired with a Samsung Android smartphone or tablet, rather than being the completely autonomous device media and communications device many consumers were expecting and hoping for."
The South Korean firm's approach contrasts with that of Sony whose forthcoming Smartwatch 2 can be paired with any device running Android 4.0 or higher.
The Galaxy watch will cost about $300 (£192) making it more expensive than Sony's device which costs £120.
Start-up Omate is planning to release a watch in October that matches Samsung's in price, but its device is set to feature a 3G chip meaning it can make calls and work as a standalone device.
The Galaxy Gear features a 1.6in (4cm) LED display, a 1.9 megapixel camera, a speaker and microphone, has four gigabytes of internal storage and a non-removable battery.
Samsung said the watch could be used as a way to make voice calls without having to take the phone it was linked to out of the owner's bag or pocket.
It comes preloaded with 10 different clock options and there will be about 70 apps available at launch including Evernote's note-taking software, auction service eBay, the social network Path and several fitness programs.