This metal detector kit reacts to metal and notifies you with sound and light. Number of soldering parts: 15 pieces; The number of parts is low, so even beginners can enjoy crafting with confidence. Comes with an instruction manual that describes metal detecting mechanisms and an explanation of electronic parts. Package Size: 1.0 x 9.3 x 13.4 inches (25 x 235 x 34●Weight: 0.08g Material: Paper, Epoxy, Copper, PP, Substrate Set Includes: PCboard, battery box, mount set, electronic parts set, electronic buzzer, solder. Detailed Size: Finished Size: 8.7 x 3.9 x 1.4 inches (220 x 100 x 35 mm).