1.Product Introduction KSCAT Bone Conduction Bluetooth Helmet Mountain Bike Helmet Red Light blue Yellow2.Product Feature KSCAT Bone Conduction Bluetooth Helmet Mountain Bike Helmet Red Light blue YellowTechnical parameters:9 hours long standbyFrequency range:20HZ-20KHZcompatible Bluetooth profiles:A2DP,AVRCP HFP HSPMicrophone sensitivity:-40DB±2DBBluetooth version:4.1 EDRPlay time:6 hoursSpeaker Sensitivity:100±3DBNoise Reduction mode:dual-microphone noise reductionweight:260g3.Product Feature KSCAT Bone Conduction Bluetooth Helmet Mountain Bike Helmet Red Light blue Yellow4.Paying and Shipping and Servicing KSCAT Bone Conduction Bluetooth Helmet Mountain Bike Helmet Red Light blue Yellow5.Recommend Products KSCAT Bone Conduction Bluetooth Helmet Mountain Bike Helmet Red Light blue Yellow1.LIVALL Cycling Helmets Intelligent-molded Bluetooth is Good Choise for Rider