Features: 2.13inch electronic ink screen small ornament, can be used for electronic marks electronic photo albums, workstation nameplates, etc. to be replaced at any time. Images can be imported and displayed directly through Bluetoothcompatible on phone, as well as various inspirational It can be equipped with two 2450 button batteries, providing an long standby time of up to 8 months. Even if the battery is removed, it can be permanently displayed without power supply. Intelligent connection, easy control: using advanced Bluetoothcompatible5.0 technology, no additional base station required, directly connected through mobile Bluetoothcompatible Customized experience: Customize, edit, and update marks content through our app. Whether it's pricetags, conference room door signs, or personalized reminders, everything is under your control. Specifications: Item:2.13in E-Ink Display Screen Module Color：Black/White Batteries:Need two 2450 Button Batteries(Not Included) Size: As Pictures Bluetoothcompatible:BT5.0 Package Includes: 1PC 2.13in E-Ink ePaper Screen note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.