Max support 4GB SD card/ U disk
PlayMP3 audio formats
Built in rechargeable Li-ion battery
Double speakers

1, max support 4GB SD Card / U Disk

2,  Speaker: 4Ω 3W*2

3, with 3.5mm standard interface connector

4. Built-in 600MA rechargeable lithium battery

5, SNR: ≥85dB    Audio: 150~18KHZ

6. can work continuously 2-3 hours

7. Double speakers

8, Power input: 5V  output: 3.7V 800MA