sentences:  Other brand names include CoxVox, CoxOrb, MiniAmp, CoxAmpPro, Coxmate SRT+, Coxmate SX which has a 10Hz GPS module to track boat speed.All deliver amplification of the coxswain's voice using a microphone and series of wired loudspeakers.Cox boxes are mainly used in eights and fours, where the readouts are used by the coxswain to monitor the performance of the crew and manage the race.