The device supports 2G mobile phone cards and IoT cards, does not support CDMA mobile phone cardsSelect network nano , need to open GPRS Internet access function and caller IDInsert the into the device (there is a schematic of the direction on the card holder), press and hold the power button for 3 seconds toThree lights are on (the black button to the deck is the power button)Power on: press and hold for 3 seconds: Press and hold for 3 seconds in the power-on statePower off (with ): long press for 10 secondsPower off (no ): long press for 3 secondsDue to different batches, the appearance and color of may be different, which will not affect the useColour:As ShownMaterial:PCBPackage Contents:1 x ModuleOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.