Wearable style fit most people headsNo screen interface display‎,‎ 8GB memory to store thousands of musics‎,‎ support most of the audio formatIt does not support the expansion cardGood waterproof function‎.‎ Can work normally under 1.5 ‎- 30 meters water for 30 minutes‎,‎ no water run into the player and no damage to performanceSolid IPX8 Waterproof Mp3 player suit for swimming‎,‎ running‎,‎ surfing‎.‎Mp3 player can connect with the computer to load / transfer songsLinked with two silicone earplugs‎,‎ the mp3 host also can remove independently‎,‎ which pop up automatically and can take out after pressing the tailAdjusting methods‎:‎ when feels tight on your head‎,‎ you can break thetail‎,‎ the angle should not too big in order to avoid stent fractureCompatible with USB 2.0 specifications‎.‎Specifications‎:‎Support system‎:‎ Windows / MAC OS systemPower supply‎:‎ built‎-in rechargeable lithium batteries ‎(‎not detachable‎)‎Operating temperature‎:‎ 0 degree to + 50 degreeFrequency response‎:‎ 30Hz and 20kHzSupports music format‎:‎ MP3 / WMA + FMCharging time‎:‎ about 2 hoursPlayback Time‎:‎ up to 4 to 6 hours ‎(‎FM is 3 hours‎)‎Waterproof design‎:‎ IPX8Charging‎:‎ USBCapacity‎:‎ 8GB ‎(‎memory size cannot be replaced‎)‎The host has five function keys‎:‎ up and down song‎,‎ the volume + / ‎-‎,‎ pause / playSize‎:‎ 130 x 120 x 15mm ‎(‎L x W x H‎)‎‎,‎ MP3 host size‎:‎ 60 x 15 x 26mm ‎(‎L x W x H‎)‎Color‎:‎ red + blackPackage‎:‎1 x MP3 Player with Earphones1 x Replacement silicone earplugs1 x USB cable