Specifications that qualify for notebooks to fall into this category can be somewhat arbitrary but in general, the machine will be significantly smaller and lighter than the average laptop. High-quality, electricity-saving components also result in longer time between battery charging. Favorable attributes make ultraportables two to three times more expensive than larger ones, from their heavier counterparts.
Middle-class mobile computers generally weigh close to 2.72 kg with 15-17 inch screens (around 38-43 cm) measured diagonally. The spacious keyboard and DVD player include possible Blu-ray ™ capabilities. USB and FireWire ports, built-in WiFi®, Ethernet, Bluetooth, webcams, and flash card readers have become standard in all. Computers in this class have basically become desktop replacements, running away from other differences that were previously made to classify very heavy desktop cellphone models, although some laptops have heavier sizes.
Netbooks (versus notebooks) are the smallest and most portable class, providing inexpensive alternatives to online surfing and basic applications. They don't come with CD / DVD drives, but they generally include built-in WiFi®, Ethernet, USB ports, flash card readers, webcams, and headphone and microphone jacks. Most have a screen appearance of 6 to 10 inches (15.24-25.40 cm).