Meco 5Pcs DIY Electronic Hourglass Kit Soldering Practice Spare Parts DC3.3-5V Speed Adjustable

Installation instruction: Click to open Feature: Model: EH-30 Working voltage: DC3.3-5V or 3*AA battery Speed: Adjustable PCB size: 74.4 x 43.7 x 24mm Color: Red LED Package includes: 5 x DIY Electronic Hourglass Kit Finish assembly, for reference only.