Features：1:Echo resonance principle using voice, deep and powerful sound wood materials guaranteed.2: Phone in this card slot, eithisr better let you enjoy this joy of music to be more convenient to let you watch this video.3:this natural wooden handmake sound amplifier enables you to share your music through passive sound amplification. Incredibly durable and renewable wooden and bamboo bring a relaxed style to any area. Our passive amplifier is hand-make to create a unique and one of a kind become.Description:This phone sound amplifier enables you to share your music through passive sound amplification. Incredibly durable and renewable wooden and bamboo bring a relaxed style to any area.Specifications：Material: Natural BambooSize: long 100mm/3.97'' width 60mm/2.36'' high 3mm/1.18(about)Package Included：1* Phone Sound Amplifier(Does not include mobile phones)