this monitor works as advertised. for those of you losing the signal regularly, there is a fix. the transmitters, either speed or cadence have 3 output settings adjustable inside the case. they come from polar set at the lowest output so they do not interfere with another riders monitor. if you open the case of the transmitter you will see a dip switch as i remember. just change the setting and give it a try, you'll not see an indication of what setting does what but trial and error will solve your problem. just make sure that the oring is seated properly when you close the case.