Bluetooth Version: V1.2 Profile: Headset Class: 2 Operation Range: 10 M Compatibility/Pairing: All Bluetooth devices V1.2 and under MP3 Specification Memory: 1GB Music Format: MP3, WMA, WAV SNR (Signal to Noise Ratio): >90dB Output of earphones: 20-40 mW (16Ohm) USB: 2.0 System: Windows 98/SE/ME/2000/XP Power Source: Built-in Rechargeable Li-ion Battery Other Features: Earphones built directly onto frame Stereo Sound Effect Earphone moves forward/ backward/ swivel 270 deg for comfortable fit Flip up glasses Playing time: 4-5 hours Talk time: ~5 hours if MP3 is off Built in MIC Call Accept/Reject/End Accessories: User Manual Case for Sunglasses USB Power Adapter Glasses Cloth