IBest 4.2inch Passive NFC Powered e Paper Black/White Ink Display, No Battery Required, Wireless Powering and Data Transfer,Refreshed by Smartphone

4.2" NFC-Powered E-Paper,Adopts Novel Passive NFC Technology,No Battery Required, No More Battery Life Trouble Wireless NFC-Powered Display Refreshing,No Messy Wiring, Stable Operation, Fast Refreshing How It Works:To Refresh The Display Content,Use A Smart Phone With NFC Function, Or An NFC Reader, Close To The E-Paper For Both Wireless Powering And Data Transfer Feel The Magic.Refreshed By Smartphone, Comes With Android APP, As Easy As Swiping A Credit Card Application Examples，Suitable For Price Tags, Asset/Equipment Tags, Shelf Labels, Conference Name Tags...