THE WOOD ITSELF IS THE SPEAKER
The sounds come from the wood itself, making it the speaker. The wood acts as the membrane of a normal speaker cone. The sound is driven to the wood which makes the wood vibrate. The sounds from the wood piece play at the range of 360°, filling an entire room with nature, meaning that the wood is non-directional.
The volume is adjustable in the mobile application, and the sound comes out over 90dB from the wood at its loudest. Therefore, it is not advisable to listen with the loudest volume at all times, but to adjust the level to play nicely in the background while the sound fills the entire space.