Professional sound cavity design, immersive,It can not only play natural sound effects, but also be used as a Bluetooth speaker with lower power consumption, fast connection and stable transmission Breathe warm light and relax the atmosphere,Breathing light effect, find inner peace between each inhalation and exhalation, and the light brightness can still be adjusted in multiple levels when the device is turned off Three-speed timer shutdown for peace of mind and focus,Short press the "Timer Off Key" to select three levels of off time. Set it before going to bed and it will automatically shut down after falling asleep Built-in battery for extended use,1800mAh large-capacity battery, up to 5 hours of battery life. Get rid of the power cord and let the natural sounds accompany you in any scene 8 Types of Sleep Sounds,The sound machine includes sounds such as rain, bird chirping, ocean waves, stream, campfire, train, crickets, and church bells (Non looping!). Each sound has a unique soothing track and independent volume control, allowing for 255 combinations. Additionally, the sleep sound machine creates a sleep, relaxation, or calming experience for both adults and children Product name:Situational speakers Product model:SM2L-B Power input:DC 5V/2A Speaker parameters:Φ40MM 40 5Wx2 Bluetooth version:V5.0 Product size:183 x 77 x 80mm Power Supply: Lithium battery (The product appearance and printed words may vary depending on the batch, but this does not affect use) It's DIY kits, needs to finish by yourself. Color: B: Aurora Green Material: ABS Package Contents: 1 * Bluetooth Speaker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.