Sound Projections SM-5D Deluxe 60ch Digital Headset Wireless OPT-600 Pkg with Comp SpeakerA top seller, The Sound Machine 5 is the ideal portable sound system for marching band directors, auctioneers, fire police rescue, and outdoor public address. The Sound Machine can deliver approximately 126db, which is almost twice the perceived loudness of a car alarm. A 1" titanium compression tweeter and 10" Eminence woofer ensures the best fidelity for both speech and music. The newly added Lithium Iron Phosphate battery is rated for 2000 charge