A device for maintaining the shape of footwear, both at the tip of a shoe as in the stiffener through a tension force against the tip and stiffener of the shoe, the same caused by the device snap-fitting and its natural tensioning element curved, is provided. Therefore data relating to a terminal type and a terminal identification are stored in a device configuration register. The mechanism includes a single, spring-loaded locking pin arranged to lock the trigger in both the ON and the OFF positions.