I currently have at my school a simplex system with Simplex push and pull tbar’s. (I do not know the model.) The NA’s are Wheelock Ns Horn strobes and a Gentex GOS in the band room. There are also vibrating bells outside the school.
Fun fact: We had a fire drill today so I got to see this system in action. The NA’s are set to code-3 and the bells are set to continuous.