Easily program your message with built-in microphone and speaker. Record up to a 60-second message. Customize message for each location. Motion detector picks up walking pedestrian from 15 ft away. Holds two 6-volt lantern batteries. Battery housing can be attached to barricade or placed inside mounting cone. Optional: Model 400AB gives warning to visually impaired through temporary pathways with unique beeping sound. Optional motion detector may be added.