USB Connection. Squire Inigma is a smart wireless access control system from Squire that uses Bluetooth communication. This charger connects via USB and enables an Inigma smart key fob to be charged for use with the range of Inigma padlocks and cylinders.. Charges the Inigma key fob. Connects via USB. Gently push the key fob into the charger and turn to the right until it stops and is locked in place. Average full charge from empty takes about 40 minutes