Radio Engineering Industries Inc. (REI) adds the SD40, a compact, lightweight, solid-state DVR to its family of BUS-WATCH digital video surveillance systems for mass transit systems and school buses. REI's SD40 features efficient H.264 video compression technology, providing faster downloads and longer recording times, utilizing REI's SD memory card. Downloading convenience with solid-state memory and low temperature performance makes the SD40 reliable, tamper-resistant and easy to maintain. By removing the postage-size REI SD card instead of a larger hard drive, videos can be downloaded quickly and easily. Additional features include connecting up to four surveillance cameras; GPS and Wi-Fi compatibility; amd 8-way sensor programming.