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Must have for all cyclists as this will be the best £1 & change you've spent for your safety during Winter evenings Main Features ● High brightness red LED, flashes while you brake ● Easy to install, suitable for the MTB, road bike with V brake or C brake ● Waterproof design, circuit with special treatment, normal use on a rainy day ● Powered by 1 x 3V / 30mAh CR1025 button battery for 50 hours use