My car alarm went off when my next door neighbour set his car alarm, normal, Faulty? It's a 68 reg Honda Civic?

My car alarm went off when my next door neighbour set his car alarm, normal, Faulty? It's a 68 reg Honda Civic?

Read more: My car alarm went off when my next door neighbour set his car alarm, normal, Faulty? It's a 68 reg Honda Civic?