Audience Size: up to 2,000. Room Size: up to 20,000 sq. ft. No messy cables to trip over. This is a professional portable public address complete sound system with built-in UHF wireless in a compact lightweight black carpeted cabinet PLUS a wireless powered dual module speaker that can be placed up to 300 feet away. The Wireless Voice Projector is a complete sound system that contains AmpliVox's powerful 50 watt multimedia stereo amplifier with built-in 16 Channel UHF receiver and 3 mic inputs plus two built-in Jensen designed 6" x 8" oval speakers. The Powered Dual Module Speaker has a built-in 50 watt amplifier. With built-in tripod mounts both components are designed for placement on a tripod, media cart, or permanent mounting. The SW225 Wireless Voice Projector can dramatically enhance presentations and communication with mixed media sound line-in for CD tape player or computer projector. It includes both headset and lapel mic and transmitter plus audio cables for laptop & projector. Each component can be powered with 10 D-cell alkaline batteries (not included) for up to 200 hours; S1460 International AC Adapter/recharger; or S1465 Rechargeable Nicad Battery Pack (requires S1460).