In an aspect, an accessory for an activity is provided, and includes an accessory housing, an impact detection device and a secondary module. The impact detection device includes at least one impact sensor selected from the group of sensors comprising an accelerometer and a gyroscope. The secondary module includes at least a battery configured for powering both the impact detection device and the secondary module. The impact detection device and secondary module together further include a microcontroller and a memory. The impact detection device is removably connectable to the secondary module and is connectable to another secondary module in another protective accessory.
