V-Tec io1 The V-TEC io1 from MSA Safety is a self-retracting lifeline, specifically designed for lift work in warehouses and fulfillment centers. The V-TEC io1?s seat-belt alarm style system helps to improve safety compliance rates by continuing to sound until workers are connected in the lift. It beeps upon waking up every time -reminding workers to connect their PPE right away. Additionally, the flashing red lights engage multiple senses so that that the user is made aware of their connection status.