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BONE CONDUCTION TECHNOLOGY: The mini bone conduction pillow speaker uses the latest bone conduction technology to deliver sound to your ears via your pillow in a vibrating, compact, and portable manner. SOFT WHISPERING SOUND: The Bluetooth pillow speaker produces a soft whisper that helps relieve stress and helps you fall asleep faster. The mini size and low-volume design are most suitable for side sleepers. BLUETOOTH VERSION 5.3: The portable pillow speaker uses Bluetooth version 5.3 for stable and clear sound. Built-in advanced rechargeable lithium battery that can operate for more than 10 hours, with a charging time of only 2 hours. TIMER FUNCTION: The bone conduction speaker has a timer function; double-click the volume up button to automatically turn off after 60 minutes, and double-click the volume down button to automatically turn off after 30 minutes. DEEP SLEEP: The Bluetooth sleep speaker is designed to relieve stress and aid deep sleep. Provides great help for adults and babies to fall asleep and reduce the problem of insomnia.