The SM4T Ceiling Speaker speaker from Bogen is available in 1-watt single-tap version or 4-watt multi-tap version. Both models feature a volume control. The 4-watt multi-tap version has a rotary switch, which eliminates transformer tap wires. The SM4T Ceiling Speaker speaker ideal paging solutions for offices, hospitals, restaurants, malls, retail stores etc. They feature durable, lightweight and attractive construction.