california sugar Portable Bluetooth Prompts Speaker Amplifier with Utility microphone for meeting, gym coaching, outdoor music player, class room teaching etc. Blue Sometimes a big voice is not enough, this product opens up so many opportunities for people to speak without yelling and still be heard well in the back of a medium sized room You can downloaded an MP3 sound clip, copied the clip to a mini-SD card, and played the clip in a loop. The most impressive thing of this speaker is you can playing music in any outdoor activities as a portable speaker. This unit is super-lightweight. You hardly even notice you're wearing it and yet the sound is crystal clear and perfect for what you need it to do. Wireless connection to your smartphone, tablet or other Bluetooth-enabled device. PLUS, Include wireless microphone that automatically connect with the speaker.