COMPATIBILITY: ONLY design for Onyx Boox GO 10.3" ePaper. NOT applicable devices :Onyx Boox Note Air3 (2023), Onyx Boox Note Air3 c (2023),Onyx Boox Note Air2 Plus (2022 ),Onyx Boox Note Air2 (2021 Released),Onyx Boox Note Air (2021), Onyx Boox Ultra C Pro (2023), Onyx Boox Ultra C(2023),Onyx Boox Ultra (2022). BUILD-IN PEN HOLDER & CARD SLOT: Our Onyx Boox GO 10.3" case is specifically designed with a pen holder to protect and store your pen. Note: Non-original remarkable pens may fall out ! Document Card Pocket is designed for you to store your business cards, bank cards, cashes, notes or bills while on the go. AUTO SLEEP/WAKE: Equipped with the automatic sleep-wake function, yourOnyx Boox GO 10.3 tablet will be activated when opening the case and automatically go into sleep mode when closing the case. Save your device's power and prolong a long battery life. MULTIPLE & ADJUSTABLE ANGLES: Our case supports horizontal and vertical functions. 3 different angles can be rotated by 360 degrees, giving you the best visual experience and sense of use. You can easily change 2 angles to suit your viewing and typing needs, whether you are working, cooking, playing with your kids or on the go. DESIGNED FOR FULL PROTECTION: Made of Premium leather exterior and soft microfiber interior holder effectively protect your Onyx Boox GO 10.3" digital paper tablet from any unwanted scratches, scuffs, and any other hard objects.