Built-in sounds: 14 built-in sounds, including 10 natural sounds, 1 train track sound, 1 fan sound and 2 white noise sounds.Timing function: press the ON/OFF button to select 60 and 120 minutes respectively, and the default mode is to play for a long time after it is turned on.Bluetooth function: Long press the Bluetooth button "Bluetooth", the voice prompts to switch to Bluetooth mode, then turn on the Bluetooth connection of the mobile phone, select the white noise 01 available device, and the connection is successful. Long press the pause button "Pause" to exit, and then switch to white noise mode.Lighting: 2 modes of warm light and bright light.Battery: White Noise is equipped with a 2500mAh lithium battery. When the battery is low, a prompt tone will appearCharging mode: the red light is on when the white noise is charging, and the green light is on when it is fully charged.