Product Name: with Mounting Ears Mylar Speaker 28mm 8ohm 2W Smart Voice Sound for Micro Loudspeaker Model NO.: SM28TD8-2.0HE Brand: Jy Certification: ISO9001, CE, RoHS WORD nChannels: 2.1Channel Usage: Expand Volume, Monitor, High Fidelity Radiation Mode: Direct Radiation Type Style: Wireless Transducer Principle: Dynamic Earphone Cone: Polypropylene and Titanium Edge Transmission Mode: Air-conduction Category: Speaker Dimension: 28mm*37.8mm*5.5mm Snr: 91dB Voice Coil Imp: 8ohm Rated(Max.)Power: 1.0(1.5)W Trademark: JY Transport Package: Paper Specification: 28mm*37.8mm*5.5mm Origin: China HS Code: 85318090 Product Description ItemSpecificationsDimensionΦ28×5.5 tRated Input Power1.0WMax Input Power1.5WRated Impedance8±15% Ω/2kHz/1VResonance Frequency(f0)700±20% Hz/1VSound Pressure Level91±3 dB at (AVG 0.8, 1.0, 1.2, 1.5 )kHz0.1W/0.1m baffle board (IEC)Frequency RangeFOHZ ~20kHzTotal Harmonic Distortion10%MAX. At 1kHz, 1.0WPolarityWhen apositive DC Current is applied to the voice coil terminal marked +or red, the diaphragm shall move forwardOperation TestMust be normal at sine wave and program source 1.0W.Buzz, Rattle, etc.Should not be audible at 2.83V sine wave between(FO Hz ~5kHz)Weight12 gVoice Coil DiameterΦ13.28 mmMagnet (NdFeB)Φ12.5×1.5t mmAppearanceShould not exist any obstacle to be harmful to normal operation; Damages, cracks, rusts and distortions, etc.Operating Temp. Range-20ºC~+60ºCStorage Temp. Range-30ºC~+60ºC