FOR AUDIENCE SIZE UP TO 1,000; FOR ROOMS UP TO 10,000 SQ FT; INCLUDES DYNAMIC CARDIOID HANDHELD MIC WITH 15-FT CORD; BUILT-IN JENSEN(R) DESIGN SPEAKER; LIGHTWEIGHT & DURABLE, WEIGHING 4 LBS WITHOUT BATTERIES ; INCLUDES COMPUTER & PROJECTOR AUDIO INTERFACE CABLES & SHOULDER STRAP; POWER WITH OPTIONAL S1460 AC ADAPTER OR POWER UP TO 200 HOURS WITH (NOT INCLUDED) 10 D ALKALINE BATTERIES ; RECHARGEABLE S1465 NICAD BATTERY PACK (REQUIRES S1460); 50W WIRELESS MULTIMEDIA STEREO AMPLIFIER WITH BUILT-IN RECEIVER