The phrase "impressive specifications" means that an item or product has notable and remarkable features or qualities that make it stand out and worthy of admiration. Full definition
The small computer comes with impressive specifications and features, despite the low price. (technowize.com)
The device packs impressive specifications along with a sturdy metal body. (phoneradar.com)
The handset maker has some impressive smartphones in its lineup that comes with powerful front facing camera and equally impressive specifications. (killerfeatures.com)