Feature:1. Advanced Technology: The pillow speaker uses the latest conduction technology to deliver sound to your ears in a vibrating, compact and portable way through your pillow.2. Soft Whisper: The bluetooth pillow speaker produces a soft whisper that helps relieve stress and helps you fall asleep faster.3. Improve Insomnia: Mini portable under pillow speakers provide great help for adults and babies to fall asleep and get rid of insomnia.4. Supports Memory Card: The pillow speaker can be inserted into a maximum of 128GB Memory Card to use to store songs. (Note: Memory Card is not included in this product)5. Compact and Mini: Portable under pillow speakers with mini size and low volume design, most suitable for side pillows.Specification:Item Type: Bluetooth Pillow SpeakerMaterial: ABSBluetooth: 5.1Transmission Distance: Approx. 5m or 16.4ftFrequency Range: 20-20KHzMemory Card Support: Up to 128GB (Not Included)Battery Type: Built in 400mAh Lithium Ion Battery.Package List:1 x Bluetooth Pillow Speaker1 x Instruction Manual1 x Data Cable