SPECIFICATIONSType: Dynamic dlosed-typeDriver: 30mm diameter; 40mm diameter actuatorImpedance: 32ohm(1kHz)Sensitivity: 102dB/mWPower handling capacty: 500mWFrequency response: 5~28,000HzCord Length: Approx 2.5 longPlug: Stereo mini-plug(3.5mm diameter),straigh-type,gold platedPower requirement: DC 3VBattery life: Approx 30hoursWeight: Approx 250g(with cord and battery