The triple-hardened TPU and PU leather construction resists yellowing and stretching for durability, while the built-in hand strap enables secure handling. This SaharaCase bi-fold folio case features an auto wake/sleep function to prolong battery lifeDesigned for use with Microsoft Surface Go 4 and Surface Go 3Complement your Microsoft device with this lightweight, formfitting case featuring an open-button design.Auto wake and sleep functionAutomatically wakes up your device when opened and puts it to sleep when the case is closed to keep the battery life longer.Built-in kickstandEnables comfortable hands-free viewing.Raised edges for screen and lensProvide additional safety for your device.Built-in hand strapOffers a firm and comfortable hold.Robust PU leather and TPU materialsThe triple-hardened construction ensures durability.