Bluetooth Headset Specifications: 1.Headphone Name: BT40 Helmet Bluetooth Earphones 2.Bluetooth Version: V5.0+EDR 3.Bluetooth model: 5.2 4.Bluetooth Distance:10M 5:Lithium Battery:3.7V/600mA. 6:Charging Time:2hours. 7:Standby Time:500 hours. 8:Working Time:90 hours. 9:Bluetooth Matching Name:BT40. Package Includes: 1 x Helmet Hesdset 6 x Headphone VELCRO 1 x USB Cable 1 x User Manual<2 x Noise reducing sponge head How to use? Step1:Take out the Helmet Headphone from the color box,stick the"Magic Tape"on both earphones. Step2:Tear off the tape paper of the earphones,and sitck it into the helmet ear position of both sides,before stick it,please align the position well. Step3:Stick the Helmet Headphones to the Velcro,Which is inside the helmet. Step4:Finish installation.Tip: please check the inner size of the helmet before ordering so that you can wear it more comfortably. The main picture of the product page shows the size of the headset. If you have any dissatisfaction, please feel free to contact us, we will help you solve the problem.