The system consists of up to 40 dispensers, each containing 6 mines, mounted on a flat bed version of the Alvis Stormer tracked armoured vehicle. The dispensers can launch mines to the sides and rear of the vehicle as it proceeds. Each mine has a programmable life, after which they self-destruct. A dispenser control unit provides fire signals, testing and arming of the self-destruct mechanism. Twenty-nine Shielder systems are currently deployed with the British Army.