Feature:1. Advanced Sound Transmission Technology: The sleep aid machine is equipped with a built in dual core bone conduction speaker that delivers clear, stereo sound straight to your ears. Thanks to adaptive noise reduction technology, you don't have to worry about sound affecting others in your vicinity. 2. Specially Designed Sleep Enhancer: This is a sleep aid sound box that is tailor made to promote comfortable sleep. It is efficient for both adults and infants, men and women alike. Whether you need a nap during day or a night's rest, it can improve your sleep quality and bring you healthier sleep patterns. 3. Bluetooth 5.3 and Premium Chip: Our wireless pillow speaker uses Bluetooth 5.3 and excellent chip to stable and clear sound. It features a digital display, supports memory card playback, timing function, and manual volume adjustment. 4. Comfortable and Non Intrusive: Just place wireless speaker under your pillow and enjoy music. Unlike other headphones that can cause pain from prolonged wear, our speaker doesn't need to be worn on ears, making it a non intrusive alternative for long term use. 5. Sustainable Battery Life: The wireless Bluetooth pillow speaker features a built in 300mAh battery that can last up to 20 hours after a full charge. This provides a more sustained and comfortable music experience. Specification: Item Type: Bone Conduction Pillow Speaker Bluetooth Version: V5.3 Frequency Range: 100HZ to 20KHZ Signal to Noise Ratio: 75dB Expandable Interface: Small memory card (maximum support 64GB, not included in delivery) Charging Interface: Type C Input Voltage: DC 5V 400mA Charging Time: 2H Playback Time: 20H (at 70% volume) Battery Type: 300mAh lithium ion battery (built in) How to Use: Simply plug in and use! Color: Black Material: ABS Package Contents: 1 x Pillow Speaker 1 x Char Cable Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.