Product Name: Mini Digital Smart Voice Mylar Speaker 20mm 8ohm 0.5W Model NO.: JY20D Brand: Jy Certification: ISO9001, CE, RoHS WORD nChannels: 2.1Channel Usage: Expand Volume Radiation Mode: Indirect Radiation Type Style: Mini Transducer Principle: Dynamic Earphone Cone: Polypropylene and Titanium Edge Transmission Mode: Air-conduction Category: Speaker Dimension: 20mm*3.5h Snr: 88dB Voice Coil Imp: 8ohm Rated(Max.)Power: 0.5(1.0)W Trademark: JY Transport Package: Paper Specification: 20mm*3.9mm Origin: China HS Code: 85318090 Product Description TypeDynamic speakerDimensionΦ20×3.5HRated Input Power0.5W sine waveMax Input Power1.0W sine waveRated Resistance8±20% ΩResonance Frequency(f0)800±20% Hz/1V SpeakerSound Pressure Level88±3dB 0.1w/0.1mat AVG 1/2f0; f0; 3/2f0; 2f0Frequency Range800HZ ~ 20KHz Average SPL -10 dB