If you want to connect portable headphones or stand-alone, more powerful speakers to your computer you should certainly look for a computer with the connection slot for headphones.
If you don't make your choice at once later it will be necessary to buy an external sound card which is an additional expense and quite often not a very convenient solution.
Bluetooth connection provides secure wireless data transmission among various devices (at the distance of up to 150 m). This is a possibility for your portable computer to connect with your mobile phone, another portable computer, palmtop and other bluetooth devices without using any wires for exchanging Mp3 music, photos and documents. You can use bluetooth for connecting wireless headphones with a microphone, mouse, keyboard, printer and other devices supporting bluetooth connection.
Examples of use of the Bluetooth technology:
• transfer of files between computers or between a computer and another device;
• printing using Bluetooth enabled wireless printer;
• use of a Bluetooth equipped keyboard or mouse, listening to music via wireless headphones;
• synchronisation of the personal digital assistant (PDA) with a computer or another device;
• wireless connection to the Internet via the mobile phone or the modem server;
• connection to the Bluetooth personal network (PAN - this is the technology that allows to establish the Ethernet network with wireless links between portable computers, mobile phones and hand devices).
*For establishing a connection with a portable computer with bluetooth; all the devices to be connected need the bluetooth support.
The battery time indicates the approximate time how long your portable computer will be able to operate after it has been disconnected from the electricity supply when the battery is fully charged.
The battery time depends on the configuration, performed operations and other factors. This indicator usually is based upon the testing results. The lithium batteries built-in modern portable computers usually provide the operation time of 3 to 5 hours and this time depends on the use and configuration of the computer. The maximum battery capacity reduces the time of use of the portable computer. Currently lithium batteries are used in computers and they replaced nickel batteries. It has to be taken into account that the lifetime of portable computer batteries is limited. The capacity decreases with time and it is necessary to replace the battery.
*The battery time may decrease depending on the loading of the portable computer during the time when the battery is used as the power supply to the computer.
