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Dear buyer:
When purchasing this Bluetooth headset, please read the following instructions: Due to long-term transportation, the power of  will be exhausted. You will not be able to use the headset when you receive the package. It may be powered off. The first thing to do is to charge the headset box for 60 minutes.Very important. Thank you!
Feature:Headphone chip: Realtek 5.0 chip
Bluetooth chip / version: V5.0 + EDR
Speaker impedance: Phimm32Omega15%
Microphone sensitivity: + -40DB
Wireless frequency: 2.405GHZ-2.480GHZ
Battery indicator: rechargeable polymer lithium battery ma * 2 + 500ma
Working temperature: -10-55 DegreeC
Power: DC5V
Material: PC + ABS
Support file formats: A2DP, AVRCP, HSP, HFP
Transmission power: CLASS 2
Wireless distance: APPROX 10M
Charging battery capacity: 400mAh
Headphone battery capacity: 50mAh
Play time: 3-5 hours (the charging box can charge 4 times for dual headphones)
Charging time: 1-2 hours