According to Michael Kasavana, National Automatic Merchandising Association at Michigan State University, the advent of reliable, affordable wireless technology has made telemetry practical and provided the medium through which cashless payments can be authenticated.[citation needed] Research shows that 50% of consumers will not purchase from a vending machine if its "Use exact change only" light is on.[citation needed] Machines with telemetry can transmit sales and inventory data to a route truck in the parking lot so that the driver knows what products to bring in for restocking. Or the data can be transmitted to a remote headquarters for use in scheduling a route stop, detecting component failure or verifying collection information.