Product name: 30 mm headset driver.
Material: plastic.
Rated impedance: 32 ohms.
Sensitivity: 110 dB+-3 dB.
Frequency action range: 20 Hz-2 0 KHZ.
Frequency features: full range.
Power: 0.5W
Total height: 5 mm.
Box contents: 2 x headphone speaker unit