Packing List: 
 
2* Mini Bluetooth Earphones 
1* Charging Box
1*USB Charging Cable
1* User Manual
 
Bluetooth chip / version: V+EDR
Speaker impedance: φmm 32Ω ± 15%
Microphone sensitivity: +-40DB
Wireless frequency: 2.405GHZ-2.480GHZ
Battery indicator: rechargeable polymer lithium battery ma*2+500ma
Working temperature: -10 -55 °C
Power: DC5V
Material: PC+ABS
Support file formats: A2DP, AVRCP, HSP, HFP
Transmission power: CLASS 2
Wireless distance: APPROX 10M 
Play time: 4 hours (charge box can charge the headset 5 times)
Charging time: 2-3 hours