1.Plastic Frame speaker,piezo speaker 2.high quality and reasonable price 3.professional manufacture 1Model No.LDMS1540S-01-R8-0.8-R2Rated Impedance (ohm)8±20%3Rated (Max.) Power (W)0.5(0.8)4Resonant Frequency (Hz)800±20%5Frequency Range (Hz)fo~60006SPL (dB)83±3 at 1k,1.6k,2k,3.2kHz, 0.1m0.5W7Buzzer &RattlesMust be normal at sine wave 2Vrms8Frame MaterialLCP9Weight (g)1.510RoHSYes