“…The instruments used to design the smart emergency light are wood parts, screws, flex gum, connecting wires, solar panel, charge controller, battery, volume adjuster, light intensity variac and charging port [23]. Smart emergency light can be designed by wooden plates as follows: height of the plate is 25 cm, width of top and bottom side 15 cm, area of the bottom and top plates is (15*15 cm), area of four sides plates is (25*15 cm), area of three sides of main light is (8.5*2 cm), area of FM dimensions is (8.5*2 cm), area of torch light is πr 2 = π(1.5) 2 , area of switch cutting is (2*1 cm), area of main light variac and volume adjuster is πr 2 = π(0.4) 2 , area of charging port is πr 2 = π(0.4) 2 , area of solar adapter port is πr 2 = π(0.5) 2 , number of screws are 18 with area of πr 2 = π(0.2) 2 , charge controller indicator area is (4*1 cm), and area of designed handle is (36*3 cm) [24]. Figure 4…”