An impact detection arrangement 30 for coupling to sports headwear to be worn by a user. The arrangement 30 has a sensor 38 for detecting an indication of an acceleration change experienced by the user's head. A visual indicator 44, such as an arrangement of LEDs, provides a visual signal when the detected acceleration change exceeds a threshold. The arrangement 30 may also include a casing 50, which may have first and second housing parts 52, 54 for encapsulating the sensor 38 and LEDs respectively. Advantageously, the present invention draws attention to a player who has experienced a high g-force to their head, immediately alerting anyone in the vicinity that a medical check is needed to assess symptoms caused by the impact. Sports headwear comprising a pocket for receiving the arrangement 30 and apparatus including the arrangement 30 and the sports headwear are also disclosed.
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