DISPLAY FEATURES Display Technology EPD Active Display Area(mm) 70.4*29.568 Resolution (Pixels) 400*168 Pixel Density ( DPI ) 144 Pixel Colors Black White Red Yellow Viewing Angle Nearly 180º Usable Pages 6 PHYSICAL FEATURES LED 1xRGB NFC Yes Operating Temperature 0~40℃ Dimensions 102.8*43.7*8.8mm Packaging Unit 200 Labels/box WIRELESS Operating Frequency 2.4-2.485GHz Standard BLE 5.0 Encryption 128-bit AES OTA YES BATTERY Battery 3 * CR2430 Battery Life 5 years (4 updates/day) Battery Capacity 900mAh COMPLIANCE Certification CE,ROHS,FCC