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<br />1 pc Mini Handfree Bluetooth Headset Earphones MIC Wireless Sport Ear Bud Mobile Phone MP3 Headset Voice Prompt Upgrade Wireless Bluetooth
<br />Type: In-Ear 
<br />Bluetooth Version: 4.1
<br />Operation Frequency Range: 2.402-2.480GHz
<br />Mic Sensitivity: +-105db
<br />Impedance: 32 ohm
<br />Type Of Built-In Battery: Rechargeable polymer Lithium battery
<br />Battery Capacity: 50 mAh
<br />Charging Time: about 2 hours
<br />Music Time: about 3 hours
<br />Talking Time: about 4-6 hours
<br />Standby Time: about 120 hours
<br />Headphone Size: Approx. 2 * 2 * 0.9cm / 0.79 * 0.79 * 0.35in