Tech-Air Street monitors the movement of the rider’s body via sensors at the shoulders. When an impact is predicted—based on algorithms developed over the past ten years and fine-tuned for the street—the system inflates via a canister of compressed argon gas in the integrated back protector. The ACU (Airbag Control Unit) is also contained within the back protector. An internal lithium-ion battery offers a 25-hour operation time and can be fully charged in six hours. Two cables connect the Tech-Air Street vest to compatible jackets—the Valparaiso touring jacket and the Viper mesh summer jacket. The system is activated when the wearer closes the zipper, and system status is conveyed via LEDs on the left forearm (as on the Tech Air race suit). Unlike the Tech-Air system used in racing applications, Tech-Air Street only offers one deployment, after which the garment must be returned to Alpinestars for inspection and refurbishment.