Features 1、Bone Conduction: This under pillow speaker utilizes bone conduction technology, transmitting sound through your pillow for an individual listening experience without disturbing others, suitable for nighttime use 2、Timed Shutdown: Designed for convenience, this pillow speaker features a one hour auto shut off timing activated by a double click on the power key, ensuring uninterrupted sleep without the need for manual shutdown 3、BT5.3 Connection: This sleep speaker supports BT5.3 connection function, and is equipped with high performance chip for fast and stable transfer, provides clearer sound, low latency, and reduced power consumption 4、Memory Card Playback: This portable pillow speaker allows you to play music files directly from a memory card (not included), offering versatile usage without the need for additional devices, for various scenarios 5、Long Endurance: Powered by a 400mAh rechargeable li battery, this under pillow speaker provides up to 8 hours of continuous playback, with quick charging and extended usage for uninterrupted music enjoyment 6、Portable and Practical: Featuring a lightweight, slim, and flat design, this bone conduction speaker is easy to use and carry, whether in your pocket or under pillow, it offers convenience. Also supports white noise mode, allowing you to easily fall asleep Specifications: Item Type: Bone Conduction Speaker Product Material: ABS Product Color: Black Connection: BT5.3 Battery: 1 x 3.7V Rechargeable Li Battery 400mAh (Built in) Charging Time: About 2 hours Distance: Approx. 10m / 32.8ft Input: 5V 400mA Play Modes: BT, White Noise, Small Memory Card (Card Not Included) Product Size: Approx. 3.5 x 1.2 x 15.5cm / 1.4 x 0.5 x 6.1in Package List 1 x Bone Conduction Speaker 1 x USB Cable 1 x User Manual