PRODUCT MATERIAL:Silicone, TPE, ABSPACKAGING MATERIAL:pvc+color cardHOW TO USE:Plug and play;Do not use high power player; Volume: push toward the + sign to turn up the volume, push toward the - sign to turn down the volume. 2.Answer button: click to answer when the call comes in, click to hang up when the call ends, click to pause/play when listening to music. Press twice for next song and press three times for previous song.FEATURES: Convenient to store, cute and attractive design.PRECAUTIONS:1. Long-time continuous use may cause damage to your ears; 2. Do not use when driving a vehicle.STORAGE METHOD:Keep away from fire and humidity. Store in a dry and cool place.