They're ultrasonic so cyclists won't hear anything more than the car's wind, road and engine noises. Operation kicks in at about 50kph. It might be a bit hard to measure range. 
Yes Dazz I wrote Cyril off,it wasn't hitting the roo though But the bridge I hit trying to avoid him when I hit some loose gravel from recent roadworks.
I have my cars fitted with the electronic ShuRoo's (Australian company based in Qld)work brilliantly,having said that ANY sonic repellers have their limitations,personally I don't think the cheap plastic ones work all that well,the animal has to be directly in front of you and I do not believe the range of the air flow ones as you have shown have anything like a 2 K range,I have them on my small truck(best deterrent on that is the thumping huge Bull bar)I just drive over them, The electronic ones also have their limitations and the company explains all of this on it's web site and on the instructions you receive with the unit,but I feel they work far more superior to the air flow ones,as in clear and semi clear country they do work some what effectively to the sides of the road,not only if the animals are directly in front of you.
I have Bull Bars on all my vehicles,that's the best defence,for the amount of miles I do I got sick of making insurance claims,hope this helps a Little in your decision making
