Specifications:
 Product name: Bluetooth headphones
 Bluetooth version: Bluetooth 4.1
 Operating range: up to 10 meters
 Compatibility: for mobile phone, tablet, PC, notebook, MP3/MP4 players
 Speaker drive unit: 40mm alloy speaker drive unit
 Impedance: 32Ω
 Frequency: 20Hz-20kHz
 Microphone: omnidirectional HD microphone
 Sensitivity: ≥ 85dB
 Distortion: ≤ 0.1%
 Rechargeable lithium battery: 250mAh
 Charging time: 1-2 hours
 Music play time: about 4-6 hours
 Talktime: about 8-10 hours
 Standby time: about 120 hours