GravityLight is an LED light powered by a bag filled with rocks, attached to a cord, which slowly descends and powers the light for up to 20 minutes. Intended as a replacement for kerosene lamps in the developing world it has no operating costs https://t.co/vUGjsRXbEk pic.twitter.com/prBU6MA3qz
— Massimo (@Rainmaker1973) November 25, 2019
Download from https://drive.google.com/open?id=1qGGqwCEHHA6tPN2TPupQgn2zO9o0aBx1.
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