Thanks to Jon Wozencroft at Touch for this link

Interesting quotes:
‘It’s not a sonic cannon. It’s not the death ray or anything like that’

‘You have to put your hands over your ears and cover them, and it’s difficult to throw stuff,’

‘The only way anybody gets hurt is if the deterrent is on full blast and they stand directly in front of it,’

Putnam said those complaining about the device have probably exposed themselves to sounds nearly as loud at rock concerts, and for longer periods of time. Walczak, the ACLU attorney, isn’t buying the analogy.

‘People don’t flee the front row of a rock concert. Why would they be fleeing here?’ Walczak asked. ‘Because it’s loud, it’s painfully loud.’

Spotlight of Sound