Saarlands University research into high-reliability wireless links used this wireless bicycle brake system. Squeezing the handlebar grip would activate the brake with a signal sent from the top blue box. Two other blue boxes act as repeaters for the signal. Repeaters are intended to boost reliability, but they can actually reduce it with digital wireless communications by taking up available data capacity, said professor Holger Hermans. The research is used to investigate wireless communications situations where safety is at stake, not actually to develop wireless bike brakes.