Flat-Magnet, Square Speaker Excellent for alarms or other voice uses Square frame Stainless steel diaphragm Dimensions: 1.6" Dia. x 0.2" H Element size: 1.6"Dia. X 0.1"H Input: Nominal: 0.4W, Max.: 0.8W Impedance (Ohm): 8 SPL (dB): 70 Frequency range (Hz): 600-6000 Weight: .02 lbs.