Ultra-thin and Discreet Design: Designed for sleeping comfort, this invisible under-pillow speaker is only 0.47 inches (1.2 cm) thick. Wrapped in soft polyester fiber and ABS material, its flat construction can be completely hidden under your mattress to provide a natural and undisturbed sleep experience. Seamless Bluetooth 5.4 Connectivity: This under-pillow Bluetooth speaker uses Bluetooth 5.4 technology, providing a stable and reliable wireless connection. Personalized Audio in Shared Room: Choose soothing white noise (ocean waves, forest streams, bird songs) or your own playlist to create the perfect sleep environment. Enjoy your favorite playlists, audiobooks, or relaxing sounds without interruption. Extra Long Battery Life and Timer Function: The wireless under-pillow speaker can play for up to 20 hours on a single charge, lasting for multiple nights. Built-in 30/60/90 minute auto-off timer helps you fall asleep naturally while saving battery. Compact and Portable - The Perfect Sleep Companion at Home and On the Go: Small and lightweight, it can be easily packed into a suitcase or backpack. Whether you're at home, in a dorm room, or on a business trip, this flat pillow speaker is an ideal travel companion.