you could do the same thing with a bit of wiring up of a car remote central locking thing, my brother fitted a cheap remote start to his mini cooper and that worked well over 300 ft away. Would cost about 25 and about 30 minutes to make but why do you need it, i just have pump varistream, tap on the end, and just hold the tap in my hand with the pole, i usually have the tap almost closed for cleaning, then full blast for rinsing.