Agree 100% Gatey, I only used on outback roads where there was no traffic either way all night and no towns or civilisation.
The comment of emergency services sirens is how I described the six noises that came from the unit they are not emergency service sirens.
To clarify.
It is simply a cheap small Jaycar item that is used to wire up to a car alarm.
I brought it by mistake thinking it was a reversing beeper.
I thought the cycle of different noises may have been better though one is a bit lame.
Jaycar link
Does it work ? My assessment only !
I think it helps but it only amplifies what roos normally do anyway and has risk of them running at you.
Without the alarm as long as your bike projects noise forward 85% to 90% of roos will jump away anyway. 10% decided to run across in front of you and 5% either stand still not knowing what to do or hop at you last minute.
With the alarm on nearly 100% reacted somehow.
95% jumped away, 4.5% stood still ears pricked 0.05% stayed down eating and three ran at the noise full speed last minute, I clipped all three .
I was happy with my split second reactions which avoided full blown hits. The first two were taken under brakes one just clipping the front wheel enough to move the bars but took a piece out of the front guard, the second went over the front wheel just grazing the lights somehow with no damage. The last one was coming flat out at the oil window low and fast I grabbed throttle and he just clipped the rear of the pannier with no damage.