【Listen Under Your Pillow, No Ear Pressure】Utilizing bone conduction and pillow resonance, it delivers clear sound quality. No earbuds are needed for comfortable listening without burdening your ears. 【Built-in White Noise & Bluetooth Playback】Easily switch between built-in white noise for sleep aid and streaming music, audiobooks, or soothing music from your phone via Bluetooth. 【Dual Sleep Timer for Peace of Mind】Automatic shut-off options of 30 minutes and 60 minutes ensure worry-free battery life and let you fall asleep with ease. 【Stable Wireless Bluetooth 5.4 Connection】Bluetooth 5.4 technology ensures fast pairing, low-latency audio, and reliable wireless performance, allowing you to enjoy smooth playback all night long. 【Ultra-Thin and Lightweight for Comfortable Side Sleeping】With a thickness of only 12mm and a weight of 48 grams, its smart design allows for discreet placement under your pillow, making it comfortable for both side and back sleepers. Dimensions: 96*12 mm Speaker size: 40 mm Charging interface: Type-C Voltage and current: 5V/1A (Supports fast charging) Material: ABS+PC+linen fabric (polyester fiber) Frequency response: 20-20kHz Impedance: 32±15% (DC) Distortion: 50~3kHz/2% Operating temperature: -20°C~55°C Sound generation method: Sound pressure air conduction Acoustic structure: Front and rear sound chamber