PRODUCT MATERIAL:Aluminum alloy, ABS plasticPACKAGING MATERIAL:PVC+COLOR CARDHOW TO USE:1. Function button: press once to answer incoming call, press once to hang up when the call ends. Press once to play or pause while listening music. Press twice for the next song, press three times for the previous song; 3. Volume: push toward the + sign to turn up the volume, push toward the - sign to turn down the volume.FEATURES: 1. Standard 3.5mm earphone plug, the R3 can be used on most portable playing devices, such as smart phones, tablets, laptops, MP3 or professional audio players etc.; 2. Protectors of various specifications are included for music listening in a comfortable way; 3. Metallic Hi-Fi earphones, simple and stylish, comfortable to wear, effectively reduce external noise.PRECAUTIONS:1. Do not pull rudely, keep away from fire and water, avoid contact with high temperature objects; 2. Do not confuse sides of L/R, otherwise it may affect the sounds effect; 3. Do not play at high volume for long time, otherwise it may affect the hearing; 4. Do not place and use the earphones near strong magnetic objects.STORAGE METHOD:Los productos empacados deben ser almacenados en temperatura de 0-40??C y en humedad relativa no m????¡s de 90%. No debe haber campo magn????¢tico fuerte en el almac????¢n, sin ????¡cido ni otros gases nocivos.