SD card Mp3 player:
1. Maximum SD card capacity: 4GB.
2. Built-in supervisory circuits.
3. Portable mini audio system

SD card mp3 player specifications:

Convenient for riding bicycle, hiking, and other outdoor activities
Maximum SD card capacity: 4 GB
Portable mini audio system
Built-in high power speaker for crystal clear audio quality
Built-in supervisory circuits which can extend battery life
Long-lasting battery
Input voltage: DC 5V / 500mA
Speaker output power: 2W x 2 (max)
Maximum SD card capacity: 4GB
Large Li-ion battery: 3.7V/1600mA
Built-in supervisory circuits
USB standard: USB2.0
Size: §74 x 191mm