The product uses high quality 1.6 mm double sided PCB board, and the circuit consists of 57 LED hourglass patterns. Under the control of the single chip computer program, the effect of analog hourglass is presented. The Mini switch can adjust the speed of the hourglass and light up the 30 LED lights. Can be used as a decorative light, power consumption of only tens of mA, less than 0.5 W, can be described as environmental protection and energy saving. The assembly process can greatly exercise your hands-on ability and develop the interest in learning electronic technology. NOTE: Shipment is in parts, you need to weld and assemble by yourself. Board Size: 75mmx44mm Operation Voltage: DC3.3--5V Colour: green+red Material: plastic+metal Package Contents: 2 Set x LED Electronic Hourglass DIY Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.