Max suppirt 4GB SD card
Play MP3 audio formats
Built in rechargeable Li-ion battery
W/blue light under buttom

1, max support 4GB SD Card

2, with 3.5mm standard interface connector

3, Built-in 500MA rechargeable lithium battery

4, Speaker: 4Ω 3W

5, SNR: ≥85dB  audio : 150~18KHZ

6,can work continuously 2-3 hours

7, single speaker.

8, Power input: 5V   output: 3.7V 1000MA

Special fuature: with blue light unter the bottom.