Product parameters Voltage input: DC5V=0.5-1.0A Power: 1W Battery: 800mAh Battery cycle times: 500 times Usage time: 30-36 hours Charging time: 1-1.5 hours Product color: white Product size: 808033mm Product weight: 100g Instructions for use The product has a total of 5 buttons, one On/Off button (including play/pause function), one timing button, one light button, one previous song (including sound minus function), and one next song (including sound plus function). A total of 9 music for sleep aid (white noise, ocean waves, crickets, rain, birds, water, lullaby 1, lullaby, 2, lullaby 3) The light button can work independently, and it can work even if it is not turned on. Press and hold the key for 0.5 seconds to turn on the key, short press to pause the playback, and play a piece of music after turning it on, and the music is made to loop all the time. Press up and down to switch, and long press to increase or decrease the volume. After booting, it will play with memory, which music will also have memory, and the next time you turn it on, it will automatically play the music that was turned off last time. Press the light button, it will be divided into 6 cycles, from 10 minutes to 0 is a cycle, 10 minutes will start the countdown, and the breathing rhythm will gradually slow down after 10 minutes. The light is bright for inhalation, the light is weak for exhalation, and the breathing is guided. This function is automatically closed for 1 hour. If the timing function is not turned on, if the timing function is turned on, press the timed time. The timing is divided into 15 minutes (bright red LED) 30 minutes (bright green LED) 60 minutes (bright blue LED) short press to switch, the fourth time closes the timer. Indicated by LED lights respectively.