An alarm device configured to monitor retail merchandise on a retail pusher system is provided. The alarm device includes a triggering mechanism that activates an alarm when retail merchandise is removed from the retail pusher system. The alarm makes store personnel aware that retail merchandise has been removed from a particular pusher system. In certain embodiments of the invention, the alarm device is disposed on a front stop of the retail pusher system. A biasing member of the pusher system biases retail merchandise into a switch of the alarm device. In this configuration, the alarm device may include a plunger switch that activates an alarm when retail merchandise is not biased into the plunger switch.