Features-The upgrade glasses BT headset.Free your ears and enjoy HIGH-definition soundwithout getting in your ears.-BT 5.0 chip,Excellent sound quality.Using BT 5.0 wireless transmission technology, thetransmission speed is fast, and the sound quality is not damaged.-Graphene diaphragm,Shocking sound quality.The high-quality dynamic drive unit presents beautiful sound quality, balanced sound effects, and powerful bass.-Support voice assistant function,Reduce cumbersome operations.Simple operation and convenient use.-UV400 polarization lens,Blocking sunlight ultraviolet rays.Multi -layer coating TAC polarizing lenses, isolation of ultraviolet rays, dazzling, reflected light, protecting the eyes from harm.SpecificationNameLecoo-C8BTversionV5.0+EDRTransmission distance10-15 mBTprotocolHSP/A2DP/AVRCPMusic time4HFrequency Range2402-2480MHZCall time5HCharging voltageUSB DC5VCharging time1.5-2HBattery capacity3.7V / 120mahStandby time200 HWeight31gPackage List1*Glasses headset1*Charging cable1*Manual