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 the adaptive noise reduction technology, you don't have to worry about the 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 the day or a night's rest, it can improve your sleep quality and bring you healthier sleep patterns. 3、Bluetooth 3 and Premium Chip: Our wireless pillow speaker uses Bluetooth 3 and excellent chip to ensure 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 the wireless speaker under your pillow and enjoy the music. Unlike other headphones that can cause pain from prolonged wear, our speaker doesn't need to be worn on the 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. 1 x Pillow Speaker1 x Type C Charging Cable1 x User Manual Item Type: Bone Conduction Pillow SpeakerMaterial: PC, ABSProduct Size: Approx. 15.5x 3.6x 1.2cm/ 6.1x 1.42x 0.47inBluetooth Version: V 5.3Frequency Range: 100HZ to 20KHZSignal to Noise Ratio: ≥75dBExpandable Interface: Small memory card (maximum support 64GB, not included in delivery)Charging Interface: Type CInput Voltage: DC 5V 400mACharging Time: 2HPlayback Time: 20H (at 70% volume)Battery Type: 300mAh lithium ion battery (built in)