... 1,This product is a device that transfer DC voltage to AC voltage.2,Its designed ... efficiency are main advantage.3,Apply for digital camera, DC/Mp3 player, mobile,vidicon, portable sound, PDA palmtop ... input: DC20.4-21.6VInput over voltage shut down:12V input: DC15-16V24V input: DC30-32VWorking temperature: ... and don't block the ventilation hole and cooling fan hole.4,To avoid electric shock, please don ...