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 fatigue2. 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 computer3. 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 connect4. 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 port5. 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 timeSpecification:Item Type: Bone Conduction Sleep SpeakerMaterial: Aluminum AlloyBT Version: 5.3Charging Mode: Type CMemory: 32GB Small Memory Card (Built in)Battery: 1 x 3.7V 400mAh Li Battery (Built in)Standby Time: 150 DaysTransmitting 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 Speaker1 x Data Cable1 x User Manual