Using the latest bluetooth chipest V4.1. 
<br />High sensitivity microphone to ensure high quality calling. 
<br />Noising cancelling chip integrated. 
<br />Innovative bullet&polygon design. 
<br />Wide application range such as car ,speakers,headphones and so on.
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<br />Operation Introductions: Basically: 
<br />Power On:Press MFB for 3s. 
<br />Power Off:Press MFB for 3s. 
<br />Pairing Mode:Press MFB for 6s.(power off status) 
<br />Exit Pairing mode:Device will exit pairing after 150s if no actions. 
<br />Shut Down:Automatically shut down if no connection in 10minutes. Calling Conversation: 
<br />Answer Phone Calling:Press MFB 1 time to answer call. 
<br />Reject Phone Calling:Press the MFB for 1s to reject the call. 
<br />Hang up the phone:Press the MFB 1 time to end conversation. 
<br />Cancel dialing:Press MFB 1 time to cancel the dialing. 
<br />Redial Last phone:Press MFB 2 times to re-dial last phone number.
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<br />Streaming Music: 
<br />Pause music:Press the MFB button 1 time. 
<br />Play music:Press the MFB button 1 time.
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<br />Bluetooth Version: V4.1 
<br />Battery Capacity: 55mA. 
<br />Charging Voltage:DC 5V. 
<br />Charging Time:2 hours 
<br />Working Time:5 hours. 
<br />Connection range:10m 
<br />Headphone Jack: 3.5mm
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<br />Package Includes: 
<br />1 x Bluetooth Bullet 
<br />1 x Micro-USB Charging Cable 
<br />1 x Instruction.