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Description:Portable wireless ampilfying speaker with rechargable battery Edm-623 is a user friendly unit design for promotion and public speaking as well as school and church events. It is a wirelss unit. Speaker can use the mic at the transmitter to speak. The voice signal will transfer to the amplifying speaker unit. The sound output is sufficient for the hall of a school or church. Frequency response: 50hz to 12khz Distance: 80 m Aduio dynamic range: over 100db Power supply: um-2 dry cell Audio poer output: 80w Speaker: 6. 5" Dimensions: 289x218x125 mm Weight: 2. 6kg