1)Play Music Directly from your Micro SD/TF Card. 2)Support MP3/WMA, can enjoy the music through earphone (with a earphone jack) and speaker. 3)Without earphone inserted, the machine can play high-quality sound and super loud music through MP3 Speaker. 4)Powerful Rechargeable Built in Speaker with adjustable volume. 5)Have dim light, glare, blinker and other file regulatory functiont. 6)It can interface to an external 5V power supply to continue to use when the inside battery is power off. 7)Tough aluminum casing. 8)Clips on and off easily to your bicycle. 9)Integrates MP3 player, flashlight torch, alarm whistle, memory disk all together Suitable for outdoor travel, fishing, hiking.