Monocle turns the phone you already have into an easy and safe bike light, allowing users to increase visibility for night riding without the inconveniences of a traditional bike light; Monocle attaches to the belt of the rider.
The Monocle application features a “battery life estimation tool” that allows you to dial in the estimated duration of your ride and the application will automatically suggest a flash frequency that will suit the length of the ride. You can also adjust the flash frequency and immediately see the impact on battery life.
via HS
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