... , NDSL, PSP, MP3/MP4, iPod, iPhone, iPadHow to know the remain power.Press the button, LED lights will ... seconds, LED lights turn on, the charger begins to charge. 4. After charging, keep pressing the button ... for 3 seconds to turn off the charger, 5. Keep the units ... when it is charged If you want to buy a sample ,pls go to our aliexpress web ,contace with Emily ...