Novel Passive NFC Technology, No Battery Required, No More Battery Life TroublePassive NFC Solution, No Battery Required, No Messy WiringTo Refresh The Display Content, Use A Smart Phone With NFC Function, Or An NFC Reader, Close To The E-Paper, It'll Be Done In A Few SecondsRefreshed By Smartphone, Comes With APPSuitable For Price Tags, Asset/Equipment Tags, Shelf Labels, Conference Name Tags, Etc.No need for backlight, off can keep the display content of the last screen for a long timeIt does not contain a supply such as battery itself, which is suitable for application environments with limited supplyThe displayed content can be customized and controlled by the user at any time through the smartphone, which is convenient and flexible SUPPLY: WirelessDISPLAY COLOR: Black / WhiteDOT PITCH: 0.217 x 0.217mmRESOLUTION: 264 x 176pixelsVIEWING ANGLE: Greater than 170REFRESH TIME: 6s (data transfer time is not included)DISPLAY SIZE: 57.29 x 38.19mmOUTLINE DIMENSION: 84.5 x 47.50mmcolor:BlueMaterial:PCBPackage Contents:1 x 2.7inch NFC-Powered e-Paper ModuleOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.