This echo speaker made by the long-standing Suzuki Ishitaro Tansu Store, creating Niigata's Kamo-style paulownia cabinets for over 130 years, does without the need for a power source and batteries. Made with the best grade of paulownia wood used in high-class paulownia cabinets. Music from your smartphone resounds as gently as the soft quality of the paulownia without an amplifier. Though the volume does not increase, the speaker gives off a natural echo like that of koto instruments made from paulownia, offering a sound different than that of an electric device. Enjoy this speaker anywhere with its compact, lightweight, and portable design.