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SWM-40R4.4-8N0.05R

Features: 
Mylar
Full Range Sound
Natural Sound & Music
Slim size
Waterproof
Characteristic Minimum Rated Maximum Notes
Type of Magnet NdFeB
Type of Frame Plastic
Type of Diaphragm PET
Type Magnetic
Sound Pressure Level dB at 30cm 78 Measured 78±3dB at 0.05W and 30cm.
Power W 0.05 0.1
Frequency kHz 0.42 0.42 4
Available Input Impedance Ω 4 8 150
Width mm 40
Height mm 4.4