Developer builds tool to track safe headphone listening time based on volume

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A developer has created a listening-time calculator to help users monitor audio exposure. The tool calculates a safe 'dose' by combining session length and decibel levels, using a standard reference of 85 dB for eight hours. For every 3 dB increase in volume, the safe listening time is halved. The tool stores session data locally in a browser and provides a daily cumulative total. It is presented as an educational model, not as medical advice.

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