How does the bus stop recorded announcement work on London buses?

The voice and display on the bus announce every stop before reaching it. The driver is not pressing anything so , as it is very accurate, is it satellite or radio controlled? Do bus stops with live displays and the newly introduced instant sms service use the same system?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).