The beeping sound from the garage door operator is an alert for persons near the garage door to stay away from the garage door while it closes. The feature must be activated only when the operator is ...The beeping sound from the garage door operator is an alert for persons near the garage door to stay away from the garage door while it closes. The feature must be activated only when the operator is installed on a sectional door. The operator must be equipped with an audible and visual warning system indicating a pending motion for five seconds before the door starts moving.