Brake pawls for use in safety systems for power equipment are disclosed. n in the formula represents a number of 1-100; X1 is an ammonia; or a triazine derivative, represented by the following general formula ; p is a number satisfying a relation of 0<p\u2266n+2;Component : a phosphate compound represented by the following general formula. The device generally includes at least one hook component including a curved portion configured to be hooked under a crossbar of a vehicle roof rack. The second electrode may, for example, be made of a metal material formed as a thin film, or be provided with apertures to thereby exhibit semitransparency.