The Signs of a Bad CMOS Battery. 1  How to Remove a Desktop Battery From the Acer Aspire. 2  How to Replace the CMOS Battery in a Dell Latitude 600. 3  How to Replace a CMOS Battery. 4  How to Clear CMOS on HP Laptops. 5  How to Make a Computer Turn on From the Motherboard.
A summary of near-field communication. Near-field communication (NFC) is a set of communication protocols that enable two electronic devices, one of which is usually a portable device such as a smartphone, to establish communication by bringing them within 4 cm (1.6 in) of each other.
Bluetooth is a radio system (commonly referred to as a wireless technology) that transmits data between devices using a method called 'frequency-hopping spread spectrum'.The radio frequency range used for Bluetooth transmissions is 2.4 - 2.48 Ghz on the ISM band (Industrial, Scientific and Medical).This is basically a low-power, short-range communication system that is robust enough to resist a moderate amount of interference and is therefore quite reliable.onsumer devices that have Bluetooth built-in typically either come with Class 1 or class 2 radios. This is basically a measure of the signal power and therefore how far it extends between your devices.