Professional sound cavity design delivers immersive audio performance. This device can play natural sound effects and also function as a Bluetooth speaker with low power consumption, fast pairing, and stable signal transmission. Features warm breathing light to help relax the atmosphere. The breathing light effect promotes calmness with each breath, and the light brightness remains adjustable in multiple levels even when the device is powered off. Equipped with a three-speed timer shutdown function for convenience and focus. Simply press the "Timer Off" button to select from three automatic shutdown intervals. Set it before bedtime and the device will power down automatically after you fall asleep. Built-in 1800mAh large-capacity lithium battery supports up to 5 hours of continuous use. Wireless design allows natural sounds to accompany you anywhere, free from power cords. Includes 8 types of sleep sounds: rain, bird chirping, ocean waves, stream, campfire, train, crickets, and church bells (non-looping). Each sound features a unique soothing track with independent volume control, enabling 255 sound combinations. Ideal for creating a sleep, relaxation, or calming environment for adults and children. Product Name: Situational Speakers Product Model: SM2L-B Power Input: DC 5V/2A Speaker Parameters: 40MM 40 5Wx2 Bluetooth Version: V5.0 Product Size: 183 x 77 x 80mm Power Supply: Lithium Battery Note: Product appearance and printed text may vary slightly by batch, but this does not affect functionality. Color Options: A: Milk Coffee Color / B: Aurora Green Material: ABS Package Contents: 1 x Bluetooth Speaker (Other items not included) Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3cm.