Feature: 1. Innovative Technology: This under pillow speaker uses bone conduction technology, offering a safer and healthier listening experience. It delivers soothing white noise directly to your ears without the need for earplugs, preventing ear fatigue 2. Flexible Playback: Supports switching between BT5.3 and memory card mode. The speaker has a built in 32GB small memory card, allowing you to play your favorite content without other device. It can be served as a U disk when inserted into a computer 3. Wireless Connection: Featuring BT5.3 chip, this pillow bone conduction speaker ensures stable and clear sound with low power consumption and zero latency within a 10 meter range. This makes it easy to use and connect 4. Convenient Use: Equipped with an LED real time battery display for clear and intuitive indication, the bone conduction speaker boasts a 400mAh battery that offers 150 days of standby time. Charging is convenient with a USB C port 5. Thoughtful Design: The bone conduction speaker supports timed playback and shutdown functions, avoiding unnecessary power waste while also giving your ears a rest during sleep time Specification: Item Type: Bone Conduction Sleep Speaker Material: Aluminum Alloy BT Version: 5.3 Charging Mode: Type C Memory: 32GB Small Memory Card (Built in) Battery: 1 x 3.7V 400mAh Li Battery (Built in) Standby Time: 150 Days Transmitting Distance: Approx. 10m / 32.8ft (Unobstructed) Product Size: Approx. 103 x 28.5 x 14mm / 4.1 x 1.1 x 0.6in. Package List: 1 x Bone Conduction Speaker 1 x Data Cable 1 x User Manual