AMPLIVOX Column Lecterns with are ideal for large conference centers. Complete audio system includes: 50-watt multimedia stereo amplifier, auxiliary input stereo jack with separate volume and tone controls for CD player, tape player or LCD computer projector, and 3 mic inputs (dynamic, condenser with phantom power, wireless) that can be used at the same time. Dynamic gooseneck microphone has on-off switch. Two built-in Jensen 6x8" oval speakers. Runs on (10) D-cell alkaline batteries, 110/240-volt international AC adapter/recharger, or NiCad rechargeable battery pack (not included). Audience size: 1500; room size: 15,000 square feet. High-pressure laminate with scratch-resistant finish. Rear of lectern includes a large storage area for papers and notes. Sculpted radius base has four hidden casters for mobility.