SPM20HP – high-performance metal sound projectors. Robust and solid aluminum body construction, built-in full range speaker, 100V transformer with power taps, and IP66 rating are SPM HP features. These sound projectors are an ideal choice for supermarkets, pools, warehouses, factory buildings, railway stations, car parking lots, and petrol stations. Dust and water resistance is the reason why this sound projector can be used in the open air as well.