5Pcs DIY Electronic Hourglass Kit Soldering Practice Spare Parts DC3.3-5V Speed Adjustable standard package The kit contains a full

The kit contains a full set of driving circuit elements and brass2

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Specifications: Motor tyoe: TT motor Working voltage: 3V - 6V For robot smart car Package included: 8 x wheels 8 x motor

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Heart rate test: hand held heart rate test

5Pcs DIY Electronic Hourglass Kit Soldering Practice Spare Parts DC3.3-5V Speed Adjustable standard package The kit contains a fullFeature: 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.