CP0187R Features Compact and mini design， even smaller than your palm Super loud and clear sound Supports TF card Can play MP3 music in the TF card directly Can be connected to mobile phones， MP3 player， computer， tablet PC and other audio device with 3.5 mm interface All-aluminum case with bright color Metal wire print button Compact and mini design for easy carrying Supports USB charging Presses the pause button continually to turn off/on With strap and can be hung on bag or bike General Specs Model E129 Type TF card speaker FM Yes Case Material All-aluminum alloy case  FM Frequency 87–108 MHz Distortion Rate 0.15% Working Time 2 hours of card playing music  Charging Time 1 hour Music Format Supported  MP3， WAV  Interface 3.5 mm Button FM， IN， the last song， the next song， pause