Rainforest Connection, a non-profit based in San Francisco, plans to install used Android smartphones in rainforests to help curtail illegal logging. The phones have been configured to trigger an alert for noises that match the sound signature of a chainsaw within an area of about a third of a square mile. The organisation claims this can be done at minimal cost – for example, in Indonesia unlimited data for one phone costs just $2.89 per month – and the phones can be powered using solar energy. The venture is seeking funding through the crowdfunding platform Kickstarter.