... function1,worldwide plug adapter with GSM voice control alarm2,highly conceal,cannot find3,never power off4,highly quality world travel adapter with USB5, ... or 850/1900MHZFunction Operation: TC-300 will start work when plug,then it can auto answer any incoming call.Funtion setting ... control call back interval.Note: *This product no need charge,plug in power, it will recharge itself.* if the product can ...