<b>Specifications:</b><br/> 1.Bluetooth Version: V5.0+EDR CSR.<br/> 2.Frequency Respones:2.402Hz-2.480GHz<br/> 3.Bluetooth Distance:20M <br/> 4:MIC Distance≤1M.<br/> 5:Lithium Battery:3.7V/900mA.<br/> 6:Charging Time:2-3 hours.<br/> 7:Standby Time:500 hours.<br/> 8:Working Time:45-60 hours.<br/> 9:Bluetooth Matching Name:BT30.<br/><br/> <b>Q&A:</b><br/> *Are earphones waterproof? What is the waterproof grade of the product ?<br/> YES.IPX7.<br/><br/>*What size are the ear speakers ?<br/><br/> The headphones are about 1.6 inches in diameter and about 0.5 inches thick.<br/><br/> *How to switch between Chinese and English?<br/>How to switch the headset language: do not connect Bluetooth, double-click the power on button twice.<br/><br/>*The Headset have Wind noise.<br/> Re connect to Bluetooth, and ride slowly when talking. <br/><br/>*Can the helmet Bluetooth headset answer the phone automatically?<br/>It cannot answer automatically. The headset can answer manually..<br/><br/><b>Package Includes:</b><br/> 1 x Helmet Hesdset<br/> 6 x Headphone VELCRO<br/> 1 x USB Cable<br/> 1 x User Manual<br/>1 x Reflective sticker(Can be attached to a helmet or motorcycle to make it safer to ride at night.)<br/><br/> <b>How to use?</b><br/> Step1:Take out the Helmet Headphone from the color box,stick the"Magic Tape"on both earphones.<br/> Step2:Tear off the 3M tape paper of the earphones,and sitck it into the helmet ear position of both sides,before stick it,please align the position well.<br/> Step3:Stick the Helmet Headphones to the Velcro,Which is inside the helmet.<br/> Step4:Finish installation.<br/><br/>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.