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Specifications: 
Bluetooth version: V4.1 
Profiles: A2DP， AVRCP， HSP， HFP 
Drivers: Φ57mm 
Impedance: 16Ω
Frequency response: 20Hz -20KHz 
SPL: 110dB 
Operating distance: up to 32 ft (no obstructions) 
Bluetooth music time: about 40 hours 
Bluetooth talk time: about 45 hours 
Standby time: about 1625 hours 
Fully charged time: about 2 hours 

Package included:
BluedioT2S wireless headphones 
Micro USB charging cable 
3.5mm Audio cable 
User manual

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