Federal Signal's StreamLine Modular Wall Mount Base is designed for lateral/wall mounting. This unit includes two M20 cord grips making this product suitable also when it's not possible to wire the base of the signaling device. To complete your signal, a Federal Signal StreamLine Modular Signal SLM100, SLM200, SLM300, SLM350, SLM400, SLM450, SLM500, SLM600, SLM700 or SLM800 is required.