Feature: 1. Bone Conduction Speaker: This pillow speaker uses bone conduction technology to transmit music to the ears and brain through resonance, without harming the ears, making it an ideal choice for soothing sleep and intimate music. 2. Timing Shutdown: This bone conduction speaker has a timed shutdown function. Double click the power key to turn on the timed shutdown, without the need to get up at night to turn off the speaker, allowing you to sleep peacefully. 3. Battery and Memory Card: Equipped with a 400mAh large capacity battery, standby for 150 days, continuous playback for 15 hours, with Type C fast charging interface. Built in 32GB memory card, can play music files anytime. 4. Reliable Performance: This wireless sleep speaker has wide compatibility, less interference, low latency, and low power consumption, allowing you to enjoy exclusive music space without disturbing people around you. 5. Wireless Connection: The pillow speaker uses BT5.3 chip, which can be effectively connected within 10 meters, and the sound is stable and clear. Equipped with LED power display, the power consumption is clear at a glance. Specification: Item Type: Bone Conduction Sleep Speaker Charging Mode: Type C Standby Time: 150 days BT Version: 5.3 Working Voltage: 3.1-4.2V Built in Memory: 32GB (Included) Product Size: Approx. 100 x 32 x 15mm / 3.9 x 1.3 x 0.6in Battery Type: 1 x 400mAh Polymer Battery (Built in) Transmissing Distance: Approx. 10m / 32.8ft (Unobstructed). Package List: 1 x Pillow Speaker 1 x USB C Data Cable 1 x User Manual