text: yaar,mujhe laga smart curtains sirf ek gimmick hain, lekin ab pata chala ki wo sunlight ke hisaab se khulte band hote hain, kaise kaam karte hain!haan, aur soch, agar aapko thoda bhi sunlight chahiye toh curtains khul jaate hain, bina kisi effort ke, ghar ki energy efficiency bhi badh jaati hai!