oblong speaker 1:dimension:30mm 2:4ohm 3:1.5w~2.0w 4:Low distortion,high sound quality,durable,reliable, ... resonant frequency:940Hz+-20%HzS.P.L.:99+-3db/1.0 Watt 0.1Meter. Average At1000,1182,1504,2000HzFrequency range:600~4 ... :-25°C~65°CStorage temperature::-25°C~65°C oblong mylar speaker