The world is going wireless.
Private investors check stock prices in real time via cell phones.
Surveyors use wireless personal digital assistants to connect with global positioning devices. Truckers receive delivery instructions and update completed orders from handheld devices without leaving their rigs. Originally developed by the military for encryption of secret data, spread-spectrum technology is virtually impenetrable to interference. The sensors are placed in the field. The controllers call out to the sensors every few seconds via broadband radio signals operating between 902-928 Mhz.