【Listen under the pillow, no ear pressure】Using bone conduction and pillow resonance, it delivers clear sound quality. No earplugs are needed for comfortable listening without pressing on the ears. 【Built-in white noise and Bluetooth playback】Easily switch between built-in white noise for sleep support and streaming music, audiobooks, or soothing music from your phone via Bluetooth. 【Dual sleep timer for peace of mind】30-minute and 60-minute auto-off options ensure worry-free battery life and let you fall asleep easily. 【Stable Bluetooth 5.4 wireless 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】Only 12mm thick and weighing 48 grams, its smart design allows for discreet placement under the pillow, making it comfortable for both side and back sleeping positions. Dimensions: 96*12 mm Speaker size: 40 mm Charging interface: Phone-C Voltage & 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