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Panneau solaire 0.5w
Source google image: https://ae01.alicdn.com/kf/HTB1EWQckH1YBuNjSszhq6AUsFXaq/Solar-Panel-0-5W-5V-Portable-Module-DIY-Small-Solar-Panel-for-Cellular-Phone-Charger-Home.jpg_220x220q90.jpg