Telefix Communications Holdings, Inc., formerly Sierra Desert Holdings, Inc. is engaged in developing field site management and documentation process and live real-time video monitoring solutions for the wireless infrastructure development, upgrade and repair market. The Company is a tier contractor, turnkey supplier and vendor for technology companies in the United States. The Company offers cell site design, integrations, upgrades and maintenance for third generation (3G) and fourth generation (4G) networks to private mobile carriers. It designs and maintains complex radio communications systems, surveillance systems, mass emergency communications, global positioning system (GPS) tracking, and E-911 systems for government, federal, state/local public safety agencies. It offers radio frequency (RF) and microwave engineering, centered on converged 3G and 4G networks for cellular, land mobile radio communications.