4.2inch Passive NFC Powered E Paper No Battery Wireless Powering and Data Transfer Fast Refreshing 400x300 Black/White Color Ink Display

4.2inch 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 Application Examples: SuItable For Price Tags, Asset/Equipment Tags, Shelf Labels, Conference Name Tags... 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;Comes With Android APP, As Easy As Swiping A Credit Card Download resources: www.waveshare.com/wiki/4.2inch_NFC-Powered_e-Paper