5V Electronic Hourglass DIY Kit Funny Electric Production Kits Precise LED Digital Hourglass DIY soldering beginner kit (26720) 5Pcs DIY Electronic Hourglass Kit Soldering Practice Spare Parts DC3.3 DC 5V Electronic Hourglass LED DIY Kit Double Layer PCB Board. Feature: Model: EH 30 Working voltage: DC3. 3 5V or 3*AA battery Speed: Adjustable PCB size: 74. 4 x 43. 7 x 24mmColor: Red LED Package includes: 5 x DIY Electronic Hourglass KitFinish assembly, for reference only.