Mini mp3 speaker PC speaker Support max 4GB SD card Built-in audio cable Built-in Li-ion battery 1, Max support 4GB SD card2, Speaker: 4 omega 3w3, SNR : max 85dB Audio : 150~18KHZ4, Audio jack : Mini 3.5mm5, Built in rechargeable 500MA Li-ion battery6, Charge time: 1~2h7, Power source: Input 5V DC Output : 3.7V 1000MA