1.Please use earphone in correct way.L stands for left , R for Right. 2. Do not pull earphone cable hard in case of breaking. 3. Do not use earphone while driving in the car or riding bike in case of traffic accident. 4. Do not use earphone in high temperature or high humidityenvironment for long time in case of damage the ear phone or shorten earphone life. 5. please use appropriate volume in case of hearing damage.