Make sure everyone knows who the best in the biz really is. * Driver unit: 40mm neodymium * Impedance: 32 ohm * Frequency: 20 Hz-20K Hz * Sensitivity: 106dB+/-3dB * Microphone Sensitivity: -58dB * Bluetooth edition: Bluetooth V4.1 W/O APTX * Frequency coverage: 2.40GHZ - 2.48GHZ ISM Band * Transmit Range: < 10m * Frequency Response: 20HZ - 20KHZ * Status Indication: LED indicator * Pairing product: Bluetooth computer with HPF, A2DP, AVRCP Bluetooth protocol, USA Bluetooth adapter, Bluetooth cell phones, etc * Batter: Rechargeable lithium ion battery, 3.7V, 250mA * Charge: Computer USB interface, output DC 5V/100mA charger * Charge Time: 2.5 hours * Operate hours: About 10 hours (battery saturation) * Standby time(pair with mobile standby): More than 200 hours (battery saturation)