Product Name: Dynamic Mini SpeakerModel Number: YD1707Place of Origin: ChinaFeatures: 1) This product is super miniature designed, and clearly sound quality, bass effect and the high SPL, wide-band, function stability, and quality credibility 2) Extensively for the bell ring and the music heavy play of the PHS, GSM 3) Frequency and band can remake according to the customers 3) Rated input: 0.5W 4) Max. input: 0.75W 5) Resonance frequency: 800±20%Hz 6) Impedance at 2kHz: 8±15%Ω 7) SPL at 1.0, 1.2, 1.5, 2.0kHz (0.1W/0.1m): 87±3dB