Features: - Material: Natural Bamboo - Stylish, Hip and Modern - A great gift for anyone who loves MUSIC! - After carbonization, the outer surface of furniture paint -No battery, no power supply -Can be used both indoor and outdoors 1:Echo resonance principle using voice, deep and powerful sound wood materials guaranteed. 2: Phone in the card slot, either better let you enjoy the joy of music to be more convenient to let you watch the video. 3:The natural wooden handmade 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-made to create a unique and one of a kind look. Color please refer to picture Size: long 100mm/3.97'' width 60mm/2.36'' high 3mm/1.18(about) Can be used for mobile phones with thickness less than 12 mm and width less than 85mm,fit for smart phone less than 6.4inch. Package Includes: 1 x Phone Sound Amplifier(Does not include mobile phones) Note: 1.Please allow 1-3mm error due to manual measurement. Please make sure you do not mind before you bid. 2.The colors may have different as the difference display, please understand.