Feature

• 3 Colors Display
• (Black, White, Red)
• 4.2 inch electronic ink screen
• Bluetooth Low Energy 5.0 technology
• Product size: 99 * 93.5 * 13.5 mm
• Endurance time: 5 Years(Updated 5 times a day)

Benefit

• Low Power Consumption
• Fast Refresh Speed & Good Stability