Item Type: DIY Bluetooth Speaker Kit_x000D_Material: Composite wood_x000D_Uses: Handcraft, puzzle Teaching_x000D_Paint Material: Wood without paint_x000D_Wooden Building Block Type: Building blocks_x000D_Battery: 1.5V AA battery x 4 (Excluded) 1[Educational and Playful] This DIY bluetooth speaker allows kids to discover how the speaker works while building their own, kids can explore the world of music through hands on activities, fun and meaningful! 2[Beautiful Sound Quality] With this DIY kit, you can achieve high quality stereo surround, if you like DIY, this music speaker kit is something you can't ignore! 3[Easy to Assemble] Our kits have clear and easy to understand instructions, and the assembly steps are not difficult, making it easy for you to assemble. 4[Perfect Holiday Gift] This DIY kit is the perfect gift for kids ages 7 to 14. After safety testing, all wood blocks are made of wood, without chemical treatment, non toxic and non irritating, creating a safe entertainment environment. 5[Complete Accessories] This kit includes all the things you need to use when splicing, you can immerse yourself in it and enjoy the fun of DIY without worrying about insufficient accessories. 2 x Building Block 1 x Battery Box 2 x Speaker 3 x Terminal Wire 1 x Screw Accessories Package 1 x Switch 1 x Screwdriver 1 x Circuit Board Because the dry battery discharge current is limited, you are advised to set the music volume of mobile phones (other devices) to 60 to 70 percent