This USB Cables are special made for MP3 and MP4 Players and MP3 Sunglasses.They are in 3 different type. MiniB4, MiniB5 and 2.5mm 4points plug. Please check the picture carefully and choose the right one for your device.(For MP4 Watches different model using different cable, please provide the correct model number in the special note, for example your MP4 Watch model number is "mpw1002x4g" then you need enter "mpw1002x4g" in special note at the checkout)