Unique remote shutdown technique, Ingenious power indicator button design: Just press the battery indicator button; you will know how much battery power left., -Built-in 1800mAh Li-polymer battery, supporting charge iPhone batter fully once, 3g hotspot for 4 hour, and Mini-AP for 12 hours charging iPhone, iPad, PSP, Android MID and Smart Phone under the status of ON or OFF, with protection for over charge/over discharge/short-circuit to keep the charging process safety. Whatever it's on or off, just press the battery indicator button, you will know how much battery power left, Compatible with HSPA + HSPA/EVDO/TD-SCDMA including more than 400 kinds of popular USB 3G modems all over the world, dial number automatically without any manual setting