Compatibility: laptops, PCs, and additional gadgets Two 3.5mm unpackaged jacks Product measurements, unpackaged: 170*230*105 mm The item Weight: roughly 312 grams Range of frequencies: 20 Hz to 20 kHz Diameter of driving coil: ç50mm 1.8-meter cable Sensitivity rating: 108dB+3dB Resistance: 320 plus 15% 50mm is the speaker's diameter. 2.2K0 is the load impedance. 30mW is the maximum power. Current: less than 100 mA Voltage: 3V DC