1. CE, RoHS, ISO, FCC

2. Rechargeable, Li-ion battery installed

3. MP3/USB/SD/MMC input, music reverb

4. Radio, song switch

This mini speaker is widely used at home, office, school, church, factory, hospital, meeting, restaurant, army etc.

Basic function: Your voice could heard loudly by others when you speak via headset microphone and voice amplified via speaker box.

Other advantage (different model different function)

1. MP3 input: If you want to amplified your MP3 volum. Just contact you MP3 to this mini amplifier by cable. You could hear amplified volum and enjoy it.

2. USB/SD/MMC input: When you want to enjoy music, just plug in you USB(SD/MMC) to the amplifier slot and you will hear music. The music also could switched preivous or next as you like.

3. Reverberation: Music could reverbed by press the button as you like.

4. FM Radio: If you want to listen to radio, just plug in the cable (have the function like antenna). Turn on the amplifier, and adjust FM by press next and previous.

We have other model that with more function of display screen, 512M Memory, telecontrol. Please feel free to tell me what is your request and I will recommend more models depend on your request.