Auckland Council says siren battles may be at the heart of Auckland’s tsunami siren vandalism problem, Newshub reports. Siren battles have been popularised in Auckland since the early 2000s, with youths attaching battery-powered speaker systems to their vehicles or bicycles. Auckland Emergency Management’s acting general manager Adam Magg said while tsunami sirens look like they would be great for playing music, they can only be used for warnings. “Their voltage makes them incompatible with vehicle systems and for playing music.”